BACKING BLOCK 3000

Groco Backing Block, Fits Seacocks 3x9D & 4x9D. Create a secure seacock installation with these rigid backing blocks.Flanged seacock installations improve with the use of a backing block between the valve flange and the hull. Each backing block size fits multiple seacock sizes. Backing blocks include threaded inserts that press into the hull side of each block, into the holes that match the seacock flange. The 1/2" thickness is rigid enough for a secure installation, but flexible enough to conform to minor hull curvature. Backing blocks will not absorb moisture.NOTE: Seacock shown for illustration only (sold separately).Key FeaturesEach size fits multiple seacock sizesThreaded inserts included to match the holes in the seacock flangeRigid 1/2" thickness is flexible enough to conform to minor hull curvatureWill not swell or absorb moistureMade from an environmentally-friendly PVC foam specially formulated for marine applicationsModelAccepts Seacock SizeDiameterThreaded Inserts159392673/4" & 1"4 9/16"5/16"-18159392751 1/4" & 1 1/2"5 3/8"5/16"-18159392832" & 2 1/2"7 1/4"3/8"-16159392913" & 4"9 1/2"1/2"-13.