![ichiro-1500x1500](https://www.rhsboating.com.au/images/com_hikashop/upload/ichiro-1500x1500.jpg)  Choose Ichiro marine oils by the requirements of your engine and maintenance schedule. The range brings marine lubrication products into one category for straightforward comparison. Check the oil type, grade and stated performance specifications against the engine manufacturer's requirements. Selecting the correct lubricant matters more than matching container appearance or assuming all marine oils are interchangeable. Explore the Ichiro listings at RHS Boating & Marine for product details and available options.

           [ ![RWB4132](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4132.jpg "Nairn Inspection Port Replacement Lid - Clear - 100mm (4 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-100mm-4-inches.html)

   $12.30  each    [ Nairn Inspection Port Replacement Lid - Clear - 100mm (4 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-100mm-4-inches.html)      [ RWB4132 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-100mm-4-inches.html)

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   [ ![RWB4135](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4135.jpg "Nairn Inspection Port Replacement Lid - Clear - 125mm (5 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-125mm-5-inches.html)

   $14.76  each    [ Nairn Inspection Port Replacement Lid - Clear - 125mm (5 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-125mm-5-inches.html)      [ RWB4135 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-125mm-5-inches.html)

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   [ ![RWB4138](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4138.jpg "Nairn Inspection Port Replacement Lid - Clear - 150mm (6 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-150mm-6-inches.html)

   $17.44  each    [ Nairn Inspection Port Replacement Lid - Clear - 150mm (6 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-150mm-6-inches.html)      [ RWB4138 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-clear-150mm-6-inches.html)

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   [ ![RWB4131](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 - White - 100mm (4 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-100mm-4-inches.html)

   $10.86  each    [ Nairn Inspection Port Replacement Lid - White - 100mm (4 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-100mm-4-inches.html)      [ RWB4131 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-100mm-4-inches.html)

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   [ ![RWB4134](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 - White - 125mm (5 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-125mm-5-inches.html)

   $12.65  each    [ Nairn Inspection Port Replacement Lid - White - 125mm (5 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-125mm-5-inches.html)      [ RWB4134 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-125mm-5-inches.html)

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   [ ![RWB4137](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 - White - 150mm (6 inches)") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-150mm-6-inches.html)

   $15.04  each    [ Nairn Inspection Port Replacement Lid - White - 150mm (6 inches) ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-150mm-6-inches.html)      [ RWB4137 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-replacement-lid-white-150mm-6-inches.html)

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   [ ![RWB4108](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4108.jpg "Nairn Inspection Port with Kit Bag - All black - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-black-125mm-5-inches-opening.html)

   $56.82  each    [ Nairn Inspection Port with Kit Bag - All black - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-black-125mm-5-inches-opening.html)      [ RWB4108 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-black-125mm-5-inches-opening.html)

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   [ ![RWB4116](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4116.jpg "Nairn Inspection Port with Kit Bag - All black - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-black-150mm-6-inches-opening.html)

   $62.55  each    [ Nairn Inspection Port with Kit Bag - All black - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-black-150mm-6-inches-opening.html)      [ RWB4116 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-black-150mm-6-inches-opening.html)

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   [ ![RWB4109](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port with Kit Bag - All white - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-white-125mm-5-inches-opening.html)

   $56.82  each    [ Nairn Inspection Port with Kit Bag - All white - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-white-125mm-5-inches-opening.html)      [ RWB4109 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-white-125mm-5-inches-opening.html)

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   [ ![RWB4117](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port with Kit Bag - All white - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-white-150mm-6-inches-opening.html)

   $62.55  each    [ Nairn Inspection Port with Kit Bag - All white - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-white-150mm-6-inches-opening.html)      [ RWB4117 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-all-white-150mm-6-inches-opening.html)

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   [ ![RWB4110](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port with Kit Bag - Black with clear lid - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-black-with-clear-lid-125mm-5-inches-opening.html)

   $60.24  each    [ Nairn Inspection Port with Kit Bag - Black with clear lid - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-black-with-clear-lid-125mm-5-inches-opening.html)      [ RWB4110 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-black-with-clear-lid-125mm-5-inches-opening.html)

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   [ ![RWB4111](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port with Kit Bag - White with clear lid - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-white-with-clear-lid-125mm-5-inches-opening.html)

   $60.15  each    [ Nairn Inspection Port with Kit Bag - White with clear lid - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-white-with-clear-lid-125mm-5-inches-opening.html)      [ RWB4111 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-white-with-clear-lid-125mm-5-inches-opening.html)

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   [ ![RWB4119](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Inspection Port with Kit Bag - White with clear lid - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-white-with-clear-lid-150mm-6-inches-opening.html)

   $67.10  each    [ Nairn Inspection Port with Kit Bag - White with clear lid - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-white-with-clear-lid-150mm-6-inches-opening.html)      [ RWB4119 ](https://www.rhsboating.com.au/categories/nairn-inspection-port-with-kit-bag-white-with-clear-lid-150mm-6-inches-opening.html)

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   [ ![400355](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/400355.jpg "Nairn Marine Drain Plug and Housing – Boat Plumbing Fittings") ](https://www.rhsboating.com.au/categories/nairn-marine-drain-plug-and-housing-boat-plumbing-fittings.html)

   $9.14  each    [ Nairn Marine Drain Plug and Housing – Boat Plumbing Fittings ](https://www.rhsboating.com.au/categories/nairn-marine-drain-plug-and-housing-boat-plumbing-fittings.html)      [ 400355 ](https://www.rhsboating.com.au/categories/nairn-marine-drain-plug-and-housing-boat-plumbing-fittings.html)

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   [ ![RWB4100](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Nylon Inspection Port - All black - 100mm (4 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-100mm-4-inches-opening.html)

   $17.83  each    [ Nairn Nylon Inspection Port - All black - 100mm (4 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-100mm-4-inches-opening.html)      [ RWB4100 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-100mm-4-inches-opening.html)

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   [ ![RWB4104](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Nylon Inspection Port - All black - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-125mm-5-inches-opening.html)

   $21.37  each    [ Nairn Nylon Inspection Port - All black - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-125mm-5-inches-opening.html)      [ RWB4104 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-125mm-5-inches-opening.html)

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   [ ![RWB4112](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Nylon Inspection Port - All black - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-150mm-6-inches-opening.html)

   $25.06  each    [ Nairn Nylon Inspection Port - All black - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-150mm-6-inches-opening.html)      [ RWB4112 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-black-150mm-6-inches-opening.html)

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   [ ![RWB4101](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Nylon Inspection Port - All white - 100mm (4 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-100mm-4-inches-opening.html)

   $17.83  each    [ Nairn Nylon Inspection Port - All white - 100mm (4 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-100mm-4-inches-opening.html)      [ RWB4101 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-100mm-4-inches-opening.html)

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   [ ![RWB4105](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Nylon Inspection Port - All white - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-125mm-5-inches-opening.html)

   $21.37  each    [ Nairn Nylon Inspection Port - All white - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-125mm-5-inches-opening.html)      [ RWB4105 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-125mm-5-inches-opening.html)

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   [ ![RWB4113](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Nylon Inspection Port - All white - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-150mm-6-inches-opening.html)

   $25.06  each    [ Nairn Nylon Inspection Port - All white - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-150mm-6-inches-opening.html)      [ RWB4113 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-all-white-150mm-6-inches-opening.html)

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   [ ![RWB4102](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4102.jpg "Nairn Nylon Inspection Port - Black with clear lid - 100mm (4 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-100mm-4-inches-opening.html)

   $20.11  each    [ Nairn Nylon Inspection Port - Black with clear lid - 100mm (4 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-100mm-4-inches-opening.html)      [ RWB4102 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-100mm-4-inches-opening.html)

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