![attwood-1500x1500](https://www.rhsboating.com.au/images/com_hikashop/upload/attwood-1500x1500.jpg)  Explore Attwood marine accessories for boat maintenance and refit projects. RWB's catalogue features vented deck fills in different configurations, cap styles and finishes. When replacing a filler, consider the tank application, filler and breather hose sizes, mounting footprint and available clearance. Selecting the correct configuration helps integrate the new fitting with your existing system. Explore the Attwood listings at RHS Boating & Marine for product details and available options.

           [ ![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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- [](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21)
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- [183](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21 "183")
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- [187](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21 "187")
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- [189](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21 "189")
- [190](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21 "190")
- [191](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21 "191")
- [192](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21 "192")
- [](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21)
- [](https://www.rhsboating.com.au/brands-listing/category/attwood-boat-deck-fills-marine-accessories/view-category/layout-listing.html?start=3927&limit=21)

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