![th-marine-1500x1500](https://www.rhsboating.com.au/images/com_hikashop/upload/th-marine-1500x1500.jpg)  Description:
Maintain the smaller fittings that keep your boat practical with selected T-H Marine hardware from RHS Boating & Marine. Explore anchor-handle catches, locking and non-locking options, replacement cam components and a thru-hull scupper for compatible installations.

Start by matching the function of the original part, then compare mounting dimensions, panel thickness requirements, cam shape and operating clearance. Drainage fittings require equally careful checking of opening size, connection details and installation position. Confirm whether you need a complete catch or a separate component before purchasing. Browse the T-H Marine range for the measurements and inclusions needed to choose a suitable replacement for your boat.

           [ ![404650](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404650.jpg "Nairn 4 inch Inspection Port Lid Only Black – Boat Hardware – 404650") ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-lid-only-black-boat-hardware-404650.html)

   $10.05  each    [ Nairn 4 inch Inspection Port Lid Only Black – Boat Hardware – 404650 ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-lid-only-black-boat-hardware-404650.html)      [ 404650 ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-lid-only-black-boat-hardware-404650.html)

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   [ ![404651](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404651.jpg "Nairn 4 inch Inspection Port Lid Only White – Boat Hardware – 404651") ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-lid-only-white-boat-hardware-404651.html)

   $10.05  each    [ Nairn 4 inch Inspection Port Lid Only White – Boat Hardware – 404651 ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-lid-only-white-boat-hardware-404651.html)      [ 404651 ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-lid-only-white-boat-hardware-404651.html)

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   [ ![404670](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404670.jpg "Nairn 4 inch Inspection Port O-Ring – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)

   $3.86  each    [ Nairn 4 inch Inspection Port O-Ring – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)      [ 404670 ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404601](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404601.jpg "Nairn 4 inch Inspection Port White – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)

   $19.28  each    [ Nairn 4 inch Inspection Port White – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)      [ 404601 ](https://www.rhsboating.com.au/categories/nairn-4-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404610](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404610.jpg "Nairn 5 inch Inspection Port Black – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-black-boat-hardware-boat-deck-cabin-hardware.html)

   $23.11  each    [ Nairn 5 inch Inspection Port Black – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-black-boat-hardware-boat-deck-cabin-hardware.html)      [ 404610 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-black-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404656](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404656.jpg "Nairn 5 inch Inspection Port Lid Only Black – Boat Hardware – 404656") ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-lid-only-black-boat-hardware-404656.html)

   $11.70  each    [ Nairn 5 inch Inspection Port Lid Only Black – Boat Hardware – 404656 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-lid-only-black-boat-hardware-404656.html)      [ 404656 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-lid-only-black-boat-hardware-404656.html)

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   [ ![404655](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404655.jpg "Nairn 5 inch Inspection Port Lid Only White – Boat Hardware – 404655") ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-lid-only-white-boat-hardware-404655.html)

   $11.70  each    [ Nairn 5 inch Inspection Port Lid Only White – Boat Hardware – 404655 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-lid-only-white-boat-hardware-404655.html)      [ 404655 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-lid-only-white-boat-hardware-404655.html)

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   [ ![404671](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404671.jpg "Nairn 5 inch Inspection Port O-Ring – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)

   $4.33  each    [ Nairn 5 inch Inspection Port O-Ring – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)      [ 404671 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404611](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404611.jpg "Nairn 5 inch Inspection Port White – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)

   $23.11  each    [ Nairn 5 inch Inspection Port White – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)      [ 404611 ](https://www.rhsboating.com.au/categories/nairn-5-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404620](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404620.jpg "Nairn 6 inch Inspection Port Black – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-black-boat-hardware-boat-deck-cabin-hardware.html)

   $27.10  each    [ Nairn 6 inch Inspection Port Black – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-black-boat-hardware-boat-deck-cabin-hardware.html)      [ 404620 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-black-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404660](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404660.jpg "Nairn 6 inch Inspection Port Lid Only Black – Boat Hardware – 404660") ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-lid-only-black-boat-hardware-404660.html)

   $13.90  each    [ Nairn 6 inch Inspection Port Lid Only Black – Boat Hardware – 404660 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-lid-only-black-boat-hardware-404660.html)      [ 404660 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-lid-only-black-boat-hardware-404660.html)

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   [ ![404661](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404661.jpg "Nairn 6 inch Inspection Port Lid Only White – Boat Hardware – 404661") ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-lid-only-white-boat-hardware-404661.html)

   $13.90  each    [ Nairn 6 inch Inspection Port Lid Only White – Boat Hardware – 404661 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-lid-only-white-boat-hardware-404661.html)      [ 404661 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-lid-only-white-boat-hardware-404661.html)

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   [ ![404672](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404672.jpg "Nairn 6 inch Inspection Port O-Ring – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)

   $5.67  each    [ Nairn 6 inch Inspection Port O-Ring – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)      [ 404672 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-o-ring-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![404621](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/404621.jpg "Nairn 6 inch Inspection Port White – Boat Hardware – Boat Deck & Cabin Hardware") ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)

   $27.10  each    [ Nairn 6 inch Inspection Port White – Boat Hardware – Boat Deck & Cabin Hardware ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)      [ 404621 ](https://www.rhsboating.com.au/categories/nairn-6-inch-inspection-port-white-boat-hardware-boat-deck-cabin-hardware.html)

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   [ ![RWB4145](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port Kit Bag - 150mm (6 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-kit-bag-150mm-6-inches.html)

   $42.45  each    [ Nairn Inspection Port Kit Bag - 150mm (6 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-kit-bag-150mm-6-inches.html)      [ RWB4145 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-kit-bag-150mm-6-inches.html)

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   [ ![RWB4140](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port O-Ring - 100mm (4 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-100mm-4-inches.html)

   $4.18  each    [ Nairn Inspection Port O-Ring - 100mm (4 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-100mm-4-inches.html)      [ RWB4140 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-100mm-4-inches.html)

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   [ ![RWB4141](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port O-Ring - 125mm (5 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-125mm-5-inches.html)

   $4.69  each    [ Nairn Inspection Port O-Ring - 125mm (5 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-125mm-5-inches.html)      [ RWB4141 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-125mm-5-inches.html)

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   [ ![RWB4142](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port O-Ring - 150mm (6 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-150mm-6-inches.html)

   $6.13  each    [ Nairn Inspection Port O-Ring - 150mm (6 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-150mm-6-inches.html)      [ RWB4142 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-o-ring-150mm-6-inches.html)

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   [ ![RWB4130](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port Replacement Lid - Black - 100mm (4 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-100mm-4-inches.html)

   $10.86  each    [ Nairn Inspection Port Replacement Lid - Black - 100mm (4 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-100mm-4-inches.html)      [ RWB4130 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-100mm-4-inches.html)

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   [ ![RWB4133](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port Replacement Lid - Black - 125mm (5 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-125mm-5-inches.html)

   $12.65  each    [ Nairn Inspection Port Replacement Lid - Black - 125mm (5 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-125mm-5-inches.html)      [ RWB4133 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-125mm-5-inches.html)

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   [ ![RWB4136](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port Replacement Lid - Black - 150mm (6 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-150mm-6-inches.html)

   $15.04  each    [ Nairn Inspection Port Replacement Lid - Black - 150mm (6 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-150mm-6-inches.html)      [ RWB4136 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-black-150mm-6-inches.html)

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Display #21

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- [](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21)
- [183](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "183")
- [184](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "184")
- [185](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "185")
- [186](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "186")
- [187](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "187")
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- [189](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "189")
- [190](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "190")
- [191](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "191")
- [192](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21 "192")
- [](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21)
- [](https://www.rhsboating.com.au/brands-listing/category/t-h-marine-boat-catches-hardware-scuppers/view-category/layout-listing.html?start=3927&limit=21)

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