{"product_id":"deck-fill-cap-black-waste-354-3570181","title":"Sea-Dog Black Waste Deck Fill Replacement Cap – 1-1\/4\" NPSM (357018)","description":"\u003cp\u003eThe \u003cstrong\u003eSea-Dog 357018 Black Waste Deck Fill Replacement Cap\u003c\/strong\u003e is a color-coded replacement cap for Sea-Dog 357010 series waste deck fill fittings. The black cap designates the \u003cstrong\u003ewaste (holding tank)\u003c\/strong\u003e fill or pump-out point — a critical safety and sanitation convention on multi-fill boats to prevent accidental cross-connection with fuel or water fills. The 1-1\/4\" x 11-1\/2 NPSM straight thread provides a secure, odor-sealing closure at the deck fitting.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBlack color coding — designates waste\/holding tank deck fitting per marine convention\u003c\/li\u003e\n\u003cli\u003eThread: 1-1\/4\" x 11-1\/2 NPSM straight\u003c\/li\u003e\n\u003cli\u003eDesigned for Sea-Dog 357010 series waste deck fill fittings\u003c\/li\u003e\n\u003cli\u003eReplacement cap only — fill body sold separately\u003c\/li\u003e\n\u003cli\u003eSKU: 354-3570181\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBest Use Case\u003c\/h2\u003e\n\u003cp\u003eUse this cap to replace a missing or damaged cap on a Sea-Dog 357010 series waste deck fitting. A missing waste cap is both a sanitation and odor issue — replace promptly to maintain a proper seal on the holding tank pump-out connection. On boats with multiple deck fills, maintaining correct color-coded caps (red = gas, green = diesel, black = waste, blue = water) is essential for safe and compliant operation.\u003c\/p\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThis is a \u003cstrong\u003ewaste (black) cap only\u003c\/strong\u003e — confirm your fill body is the Sea-Dog 357010 series and uses 1-1\/4\" x 11-1\/2 NPSM straight thread before ordering. For the matching color-coded caps in this series, see the \u003ca href=\"\/products\/cap-for-357010-gas-red-354-3570151\"\u003eSea-Dog Red Gas Deck Fill Cap (357015)\u003c\/a\u003e and the \u003ca href=\"\/products\/deck-fill-cap-green-diesel-354-3570161\"\u003eSea-Dog Green Diesel Deck Fill Cap (357016)\u003c\/a\u003e. For a complete deck fill assembly, see the \u003ca href=\"\/products\/seadog-3570301-gas-deckfill-w-keyless-cap\"\u003eSea-Dog 3570301 Gas Deck Fill with Keyless Cap\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199442059300,"sku":"354-3570181","price":15.29,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/354-3570151_3573991_8959d846-49b3-48cb-bc27-5ba7c4880dd7.jpg?v=1785605477","url":"https:\/\/marisolmarine.com\/products\/deck-fill-cap-black-waste-354-3570181","provider":"Marisol Marine Company","version":"1.0","type":"link"}