Use 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:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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