![GROCO Backing Block f/3/4" 1" Seacocks [BB-1]](https://www.greathardwaredepot.com/wp-content/uploads/2026/09/groco-backing-block-f-3-4-1-seacocks-bb-1.webp)
Backing Block for 3/4″ & 1″ Seacocks
Features:
- Each size fits multiple seacock sizes
- Press threaded brass inserts into the hull side of the backing block into the holes that match the seacock flange
- Rigid 1/2″ thickness provides secure installation but is flexible enough to conform to minor hull curvature
- Will not swell or absorb moisture
- Made from an environmentally friendly PVC foam specially formulated for marine applications
Specifications:
- Construction: Bronze
- Box Dimensions: 1″H x 7″W x 9″L WT: 0.2 lbs
- UPC: 742985169845
![GROCO Backing Block f/1-1/4" 1-1/2" Seacocks [BB-2]](https://www.greathardwaredepot.com/wp-content/uploads/2026/09/groco-backing-block-f-1-1-4-1-1-2-seacocks-bb-2.webp)
![Perko 0541Vented Fill f/1-1/2" Hose - Straight Neck - Gas [0541DPGCHR]](https://www.greathardwaredepot.com/wp-content/uploads/2026/09/perko-0541vented-fill-f-1-1-2-hose-straight-neck-gas-0541dpgchr.webp)
![Perko 0540 Gas Fill/Vent f/1-1/2" Hose - Angled Neck [0540DPGCHR]](https://www.greathardwaredepot.com/wp-content/uploads/2026/09/perko-0540-gas-fill-vent-f-1-1-2-hose-angled-neck-0540dpgchr.webp)
![GROCO 1" Bronze Flanged Full Flow Seacock [BV-1000]](https://www.greathardwaredepot.com/wp-content/uploads/2026/09/groco-1-bronze-flanged-full-flow-seacock-bv-1000.webp)
