![nairn-1500x1500](https://www.rhsboating.com.au/images/com_hikashop/upload/nairn-1500x1500.jpg) Find Nairn inspection ports and selected replacement components for your boat. The catalogue features Australian-made nylon ports in different sizes, lid colours and configurations. For a replacement lid or seal, identify the existing port and compare the specified size carefully. Opening diameter and overall dimensions are different measurements and both may matter when planning a new installation. Explore the Nairn listings at RHS Boating & Marine for product details and available options. [ ![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) [+](#) [–](#) [ ![RWB4106](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4106.jpg "Nairn Nylon Inspection Port - Black with clear lid - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-125mm-5-inches-opening.html) $23.34 each [ Nairn Nylon Inspection Port - Black with clear lid - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-125mm-5-inches-opening.html) [ RWB4106 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-125mm-5-inches-opening.html) [+](#) [–](#) [ ![RWB4114](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/RWB4114.jpg "Nairn Nylon Inspection Port - Black with clear lid - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-150mm-6-inches-opening.html) $26.42 each [ Nairn Nylon Inspection Port - Black with clear lid - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-150mm-6-inches-opening.html) [ RWB4114 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-black-with-clear-lid-150mm-6-inches-opening.html) [+](#) [–](#) [ ![RWB4103](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 - White with clear lid - 100mm (4 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-100mm-4-inches-opening.html) $20.11 each [ Nairn Nylon Inspection Port - White with clear lid - 100mm (4 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-100mm-4-inches-opening.html) [ RWB4103 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-100mm-4-inches-opening.html) [+](#) [–](#) [ ![RWB4107](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 - White with clear lid - 125mm (5 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-125mm-5-inches-opening.html) $23.34 each [ Nairn Nylon Inspection Port - White with clear lid - 125mm (5 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-125mm-5-inches-opening.html) [ RWB4107 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-125mm-5-inches-opening.html) [+](#) [–](#) [ ![RWB4115](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 - White with clear lid - 150mm (6 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-150mm-6-inches-opening.html) $26.42 each [ Nairn Nylon Inspection Port - White with clear lid - 150mm (6 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-150mm-6-inches-opening.html) [ RWB4115 ](https://www.rhsboating.com.au/categories/nairn-nylon-inspection-port-white-with-clear-lid-150mm-6-inches-opening.html) [+](#) [–](#) [ ![RWB4120](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/chatgpt_image_sep_24_2026_09_02_48_am.jpg "Nairn Pry-Out Inspection Port - White - 200mm (8 inches) Opening") ](https://www.rhsboating.com.au/categories/nairn-pry-out-inspection-port-white-200mm-8-inches-opening.html) $64.80 each [ Nairn Pry-Out Inspection Port - White - 200mm (8 inches) Opening ](https://www.rhsboating.com.au/categories/nairn-pry-out-inspection-port-white-200mm-8-inches-opening.html) [ RWB4120 ](https://www.rhsboating.com.au/categories/nairn-pry-out-inspection-port-white-200mm-8-inches-opening.html) [+](#) [–](#) [ ![400356](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/400356.jpg "Nairn Replacement Marine Drain Plug – Boat Plumbing Fittings") ](https://www.rhsboating.com.au/categories/nairn-replacement-marine-drain-plug-boat-plumbing-fittings.html) $7.34 each [ Nairn Replacement Marine Drain Plug – Boat Plumbing Fittings ](https://www.rhsboating.com.au/categories/nairn-replacement-marine-drain-plug-boat-plumbing-fittings.html) [ 400356 ](https://www.rhsboating.com.au/categories/nairn-replacement-marine-drain-plug-boat-plumbing-fittings.html) [+](#) [–](#) [ ![260542](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/260542.jpg "Nairn round slop stopper – Black – Marine Engine Accessories") ](https://www.rhsboating.com.au/categories/nairn-round-slop-stopper-black-marine-engine-accessories.html) $10.57 each [ Nairn round slop stopper – Black – Marine Engine Accessories ](https://www.rhsboating.com.au/categories/nairn-round-slop-stopper-black-marine-engine-accessories.html) [ 260542 ](https://www.rhsboating.com.au/categories/nairn-round-slop-stopper-black-marine-engine-accessories.html) [+](#) [–](#) [ ![260543](https://www.rhsboating.com.au/images/com_hikashop/upload/thumbnails/500x500/260543.jpg "Nairn round slop stopper – White – Marine Engine Accessories") ](https://www.rhsboating.com.au/categories/nairn-round-slop-stopper-white-marine-engine-accessories.html) $10.57 each [ Nairn round slop stopper – White – Marine Engine Accessories ](https://www.rhsboating.com.au/categories/nairn-round-slop-stopper-white-marine-engine-accessories.html) [ 260543 ](https://www.rhsboating.com.au/categories/nairn-round-slop-stopper-white-marine-engine-accessories.html) [+](#) [–](#) Display #21 - 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