{"product_id":"centek-vernatube-4-to-3-fiberglass-reducer-coupling-marine-exhaust","title":"Centek Vernatube 4\" to 3\" Fiberglass Reducer Coupling | Marine Exhaust Fitting","description":"\u003ch2\u003e4\" to 3\" Fiberglass Reducer Coupling for Marine Wet Exhaust Systems\u003c\/h2\u003e\u003cp\u003eStep down your exhaust line cleanly and reliably with this 4\" to 3\" fiberglass reducer coupling. Made from the same fire-retardant fiberglass resin used in Centek’s Vernatube exhaust hose, this coupling is built to handle the heat, moisture, and vibration of a marine wet exhaust system — without the corrosion risk of metal fittings.\u003c\/p\u003e\u003cp\u003eWhether you’re routing around an obstacle, transitioning between hose sizes, or replacing a damaged section of your exhaust run, this coupling installs quickly and holds up in the long term.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eReduces from 4\" to 3\" — ideal for transitioning between exhaust hose sizes in a wet exhaust system\u003c\/li\u003e\n\u003cli\u003eConstructed from fire-retardant fiberglass resin — the same material used in Centek Vernatube exhaust hose\u003c\/li\u003e\n\u003cli\u003eLightweight, strong, non-corroding, and durable\u003c\/li\u003e\n\u003cli\u003eCompatible with standard marine wet exhaust hose clamp installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eComplete Your Exhaust Run\u003c\/h3\u003e\u003cp\u003ePair this reducer with Centek’s fiberglass elbow fittings to route your exhaust around tight corners and obstacles:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/centek-1200109-elbow-45-3-383-1200109\"\u003eCentek 45° Elbow – 3\"\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/centek-1200111-elbow-45-3-5-383-1200111\"\u003eCentek 45° Elbow – 3.5\"\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/centek-1200112-elbow-45-4-383-1200112\"\u003eCentek 45° Elbow – 4\"\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/centek-1200113-elbow-45-5-383-1200113\"\u003eCentek 45° Elbow – 5\"\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/centek-1200114-elbow-45-6-383-1200114\"\u003eCentek 45° Elbow – 6\"\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/centek-1200157-elbow-90-4-383-1200157\"\u003eCentek 90° Elbow – 4\"\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThis reducer is most commonly used when an engine’s exhaust outlet is 4\" but the downstream hose run or waterlock inlet is 3\" — a common mismatch on repowered vessels or when upgrading to a smaller-diameter exhaust system. It’s also used in reverse (3\" to 4\") when stepping up to a larger hose run for reduced back-pressure on higher-output engines. If you’re unsure which size reducer or elbow combination you need for your exhaust layout, contact our parts desk with your engine make, model, and exhaust outlet diameter and we can help you spec the right fittings.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156126892068,"sku":"383-1200170","price":139.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_35ab5c5a-bbc7-4755-b64a-0ca11cac7896.jpg?v=1785532787","url":"https:\/\/marisolmarine.com\/products\/centek-vernatube-4-to-3-fiberglass-reducer-coupling-marine-exhaust","provider":"Marisol Marine Company","version":"1.0","type":"link"}