{"product_id":"groco-bronze-vented-loop-hvl-1000-1-inch-hose-anti-siphon-valve","title":"GROCO Bronze Vented Loop HVL-1000, 1 Inch Hose Anti-Siphon Valve","description":"\u003cp\u003eThe GROCO HVL-1000 is a bronze vented loop built to accept 1 inch hose, designed to prevent siphoning and backflow in below-waterline plumbing runs such as head discharge, raw water washdown, and other through-hull applications where a loop must be installed above the waterline. Bronze construction resists corrosion in marine environments and provides long service life compared to plastic alternatives. The fitting measures 8 inches in length by 7 inches in width, with a 1 inch outside diameter and a nominal wall thickness of 0.125 inches, giving it the rigidity needed to hold its shape and seal reliably under vacuum and pressure conditions typical of onboard plumbing systems.\u003c\/p\u003e\u003cp\u003eInstalled at the high point of a hose run, the vented loop opens to atmosphere when the system loses vacuum, breaking any siphon before water can be drawn back through a through-hull fitting below the waterline. This is a critical safety component for preventing unwanted flooding in systems like marine heads. The GROCO HVL-1000 is compatible with standard 1 inch marine hose used throughout the boat's plumbing system.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Groco\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e HVL-1000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Size:\u003c\/strong\u003e 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Wall Thickness:\u003c\/strong\u003e 0.125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Length:\u003c\/strong\u003e 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8 inches L x 7 inches W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.9 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 742985003071\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the GROCO HVL-1000 used for?\u003c\/strong\u003e The HVL-1000 is a bronze vented loop that breaks siphon action in below-waterline hose runs, preventing water from being drawn back through a through-hull fitting into the boat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat hose size does the HVL-1000 fit?\u003c\/strong\u003e This vented loop is sized for 1 inch hose, matching its 1 inch outside diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the HVL-1000 made from?\u003c\/strong\u003e Bronze, chosen for its corrosion resistance in marine plumbing applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the HVL-1000 weigh?\u003c\/strong\u003e The GROCO HVL-1000 weighs 1.9 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the HVL-1000 vented loop?\u003c\/strong\u003e It measures 8 inches in length by 7 inches in width, with a nominal wall thickness of 0.125 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere should a vented loop like the HVL-1000 be installed?\u003c\/strong\u003e Vented loops are installed at the highest point of a hose run, above the waterline, so they can open to atmosphere and break any siphon before it can pull water back into the boat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the HVL-1000 made of plastic or metal?\u003c\/strong\u003e It is a bronze fitting, not plastic, giving it added durability and corrosion resistance over plastic vented loops.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the HVL-1000?\u003c\/strong\u003e The HVL-1000 ships as the complete bronze vented loop fitting sized for 1 inch hose.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a marine head or through-hull system need a vented loop?\u003c\/strong\u003e Without a vented loop such as the HVL-1000, a loss of vacuum in a below-waterline hose run can allow water to siphon back through the through-hull, leading to unwanted flooding.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the HVL-1000 work with standard marine hose?\u003c\/strong\u003e Yes, it is designed to accept 1 inch marine hose commonly used in onboard plumbing systems.\u003c\/p\u003e","brand":"Groco","offers":[{"title":"Default Title","offer_id":49031097057499,"sku":"GRO-HVL-1000","price":181.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/61hZX4dBqnL.jpg?v=1785208672","url":"https:\/\/www.goodvibesmarina.com\/products\/groco-bronze-vented-loop-hvl-1000-1-inch-hose-anti-siphon-valve","provider":"Good Vibes Marina","version":"1.0","type":"link"}