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Add to CartUse 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.
Specifications:
What 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.
What 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.
How 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.
Which 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.
Which 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.
Will 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.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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