Groco Backing Blocks – Flanged Seacocks

Groco Backing Blocks for Flanged Seacocks – Secure & Reliable Marine Installations

Groco backing blocks improve the installation of flanged seacocks, providing a secure, stable base that reduces the risk of leaks and decreases installation time. Designed specifically for marine use, these blocks ensure a solid, long-lasting connection between your seacock flange and hull.

Manufactured from an environmentally friendly PVC foam specially formulated for marine environments, these blocks will not swell or absorb moisture over time. The durable and rigid 1/2″ thickness delivers robust support while remaining flexible enough to conform to minor hull curvatures, ensuring a perfect fit every time.

Each block is designed to fit multiple seacock sizes and comes with threaded brass inserts pressed into the hull side of the block. These inserts align with the flange holes for easy installation and are made with UNC (Unified National Coarse Thread), compatible with standard ISO metric threads for seamless integration with marine hardware.

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