GROCO BB-2 Backing Block - 5 - 16"-18 Threaded Inserts - for 1-1 - 4" & 1-1

Ensure an unyielding foundation for your seacocks with the GROCO BB-2 Backing Block. Engineered from marine-grade PVC foam, this essential component provides superior stability and resists the harsh realities of the marine environment. Its rigid yet flexible design perfectly accommodates minor hull curvatures, creating a flush and secure mounting surface for your critical thru-hull fittings. Upgrade your marine plumbing system for enhanced safety and durability today.

Key Benefits & Features:

• Rigid 1/2" Thickness: Provides a robust and secure mounting base for flanged seacocks, while its inherent flexibility allows it to conform to minor hull curvatures for a precise fit.
• Marine-Grade PVC Foam Construction: Specially formulated to be environmentally friendly, this material will not swell or absorb moisture, guaranteeing long-term integrity and performance in saltwater applications.
• Integrated 5/16"-18 Brass Threaded Inserts: Features pre-installed brass inserts that press into the hull side of the block, providing reliable and robust connection points for secure seacock installation.
• Versatile Compatibility: Designed specifically for use with 1-1/4" and 1-1/2" flanged seacocks (equivalent to GROCO Seacock Sizes 1250 and 1500), offering broad application flexibility.
• Optimized Diameter: With a 5.38-inch diameter, the BB-2 ensures ample surface area for secure mounting and enhanced structural support.

Recommended Pairings: For optimal galvanic compatibility and strength, use high-quality stainless steel bolts with the installed brass inserts.