{"product_id":"xiaoyudou-1-1-2-npt-marine-fuel-cap-0540dpg99a-vented-perko-style-replacement-o-ring-chain-kit","title":"Xiaoyudou 1-1\/2\" NPT Marine Fuel Cap 0540DPG99A — Vented Perko-Style Replacement, O‑Ring \u0026 Chain Kit","description":"\u003cp\u003e\u003cstrong\u003eThe Xiaoyudou 0540DPG99A is a 1-1\/2\" NPT threaded vented marine fuel cap kit made to replace Perko-style deck fills and maintain a watertight, pressure-stable fuel system.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for boats using angled 1-1\/2\" NPT vented deck fills, this replacement gas cap kit includes the cap, O-ring, wrench and safety chain so you have everything needed at installation. It recreates the venting function required by many non-EPA sealed systems to prevent vacuum locks and excessive pressure while resisting corrosion in harsh marine conditions.\u003c\/p\u003e\n\n\u003ch3\u003eWill this cap fit my Perko-style deck fill?\u003c\/h3\u003e\n\n\u003cp\u003eYes — the 0540DPG99A is made to match several Perko deck fill figure numbers. It is specifically for vented 1-1\/2\" angled-neck fills using NPT threads, not BSP or sealed EPA systems.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible with Perko figure numbers 0540, 0541, 0556 and 0557\u003c\/li\u003e\n  \u003cli\u003eUses 1-1\/2\" NPT (National Pipe Thread) standard\u003c\/li\u003e\n  \u003cli\u003eNot compatible with British Standard Pipe (BSP) threads\u003c\/li\u003e\n  \u003cli\u003eUnsuitable for closed EPA-compliant sealed fuel systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the vent and seal design protect my fuel system?\u003c\/h3\u003e\n\n\u003cp\u003eThis cap combines a gasketed, watertight seal with an integrated venting path that equalizes tank pressure during normal operation. The design helps prevent fuel spillage from pressure buildup and reduces the chance of vapor lock or fuel starvation caused by vacuum conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eO-ring ensures a secure waterproof closure at the deck fill\u003c\/li\u003e\n  \u003cli\u003eVenting structure stabilizes internal tank pressure while underway\u003c\/li\u003e\n  \u003cli\u003eHelps avoid vacuum lock and pressure-induced leaks\u003c\/li\u003e\n  \u003cli\u003eIntended for vented marine fuel tanks, not sealed systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s included and how easy is installation?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit is supplied with the replacement cap, a matching O-ring, a simple wrench for tightening and a chain to retain the cap on deck. Installation is straightforward for anyone familiar with threaded deck fills and basic marine maintenance.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eComplete kit: cap, O-ring, wrench and chain included\u003c\/li\u003e\n  \u003cli\u003eThreaded 1-1\/2\" NPT connection screws into existing angled neck fill\u003c\/li\u003e\n  \u003cli\u003eUse the supplied wrench to achieve correct torque without damaging threads\u003c\/li\u003e\n  \u003cli\u003eChain anchors cap to deck to prevent loss while fueling or underway\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is this replacement cap for saltwater use?\u003c\/h3\u003e\n\n\u003cp\u003eManufactured from high-strength, corrosion-resistant materials, the cap is intended to withstand marine exposure, wear and repeated use. Its construction focuses on long-term durability where salt, sun and vibration are common.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHigh-strength materials offer corrosion and wear resistance\u003c\/li\u003e\n  \u003cli\u003eDurable finish reduces maintenance and extends service life\u003c\/li\u003e\n  \u003cli\u003eDesigned for the mechanical demands of boating environments\u003c\/li\u003e\n  \u003cli\u003eRegular inspection and O-ring replacement extend reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Owners of boats with vented 1-1\/2\" NPT angled neck Perko-style deck fills who need a complete, corrosion-resistant replacement kit. Choose this Xiaoyudou model if you require a vented cap (not for sealed or BSP-threaded systems), want an included O-ring and wrench for immediate installation, and prefer a cap built to resist marine wear.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this cap compatible with BSP threads?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The Xiaoyudou 0540DPG99A is for 1-1\/2\" NPT threads only and not compatible with BSP-threaded fills.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this on an EPA sealed fuel system?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This cap is designed for vented marine fuel systems and should not be used on closed EPA-compliant sealed tanks.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Xiaoyudou","offers":[{"title":"Default Title","offer_id":56830200676692,"sku":"B0GK78HZDK","price":58.21,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/xiaoyudou-front-cap-view.jpg?v=1787002620","url":"https:\/\/gardenluxe.co.uk\/products\/xiaoyudou-1-1-2-npt-marine-fuel-cap-0540dpg99a-vented-perko-style-replacement-o-ring-chain-kit","provider":"Gardenluxe Uk","version":"1.0","type":"link"}