{"product_id":"groco-seacock-backing-block","title":"Groco Seacock Backing Block","description":"\u003cp\u003eGroco Seacock Backing Block\u003c\/p\u003e\u003cp\u003eUse the Groco Seacock Backing Block to improve flanged seacock installation. Groco backing blocks are made from an environmentally-friendly PVC foam specially formulated for marine applications. The rigid 1\/2\" thickness provides secure installation but is flexible enough to conform to minor hull curvature. To install, press threaded brass inserts into the hull side of the backing block into the holes that match the seacock flange.\u003c\/p\u003e\u003cp\u003eEach size fits multiple seacock sizes\u003c\/p\u003e\u003cp\u003eWill not swell or absorb moisture\u003c\/p\u003e\u003cp\u003eSpecifications:\u003c\/p\u003e\u003cp\u003eModel: BB-1\u003c\/p\u003e\u003cp\u003eFits Seacock Sizes 750 and 1000\u003c\/p\u003e\u003cp\u003eBacking Block Diameter: 4.29\"\u003c\/p\u003e\u003cp\u003eInsert Threads: 5\/16-18\u003c\/p\u003e\u003cp\u003eModel: BB-2\u003c\/p\u003e\u003cp\u003eFits Seacock Sizes 1250 and 1500\u003c\/p\u003e\u003cp\u003eBacking Block Diameter: 5.38\"\u003c\/p\u003e\u003cp\u003eInsert Threads: 5\/16-18\u003c\/p\u003e\u003cp\u003eFrequently Asked Questions\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eWhat is the Groco Seacock Backing Block used for? The Groco Seacock Backing Block is designed to improve flanged seacock installation. It is made from a marine-formulated PVC foam with a rigid 1\/2-inch thickness for secure installation while remaining flexible enough to conform to minor hull curvature.\u003c\/li\u003e\n\u003cli\u003eWhat material is the Groco Seacock Backing Block made from? Groco Seacock Backing Blocks are made from an environmentally friendly PVC foam specially formulated for marine applications. The material will not swell or absorb moisture, according to the product description.\u003c\/li\u003e\n\u003cli\u003eHow do I install the Groco Seacock Backing Block? To install the backing block, press the threaded brass inserts into the hull side of the block. Use the holes that correspond with the flange of the seacock being installed. The backing block is intended to provide support for flanged seacock installations.\u003c\/li\u003e\n\u003cli\u003eWhich seacock sizes fit the Groco BB-1 backing block? The Groco BB-1 backing block fits Seacock Sizes 750 and 1000. It has a 4.29-inch backing block diameter and uses 5\/16-18 insert threads.\u003c\/li\u003e\n\u003cli\u003eWhich seacock sizes fit the Groco BB-2 backing block? The Groco BB-2 backing block fits Seacock Sizes 1250 and 1500. It has a 5.38-inch backing block diameter and uses 5\/16-18 insert threads.\u003c\/li\u003e\n\u003cli\u003eWill the Groco Seacock Backing Block absorb moisture? No. The Groco Seacock Backing Block is made from PVC foam that will not swell or absorb moisture. Its 1\/2-inch thickness provides rigid support while allowing the block to conform to minor hull curvature.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Groco","offers":[{"title":"1 1\/4\" - 1 1\/2\"","offer_id":50581695136002,"sku":"GRO-BB-2","price":96.49,"currency_code":"USD","in_stock":false},{"title":"750-1000","offer_id":50581695168770,"sku":"GRO-BB-1","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/3024\/2562\/files\/gro-bb-1_1__52437.1722354644.webp?v=1791078288","url":"https:\/\/allmarineworld.com\/products\/groco-seacock-backing-block","provider":"All Marine World","version":"1.0","type":"link"}