GROCO Flanged Adaptors for Ball Valves

Eliminate common thread mismatches between ball valves and thru-hulls.

These Flanged Adaptors combine NPS threads on the bottom and NPT threads on the top to eliminate common (and dangerous) thread mismatches when in-line ball valves are screwed onto thru-hulls. The triangular base provides strain relief to the hull.

Bronze fittings have an outer surface that is rough in feel and appearance, almost like it’s covered with sand. That’s because bronze fittings are sand cast, and then machined. Bronze is known for excellent resistance to harmful corrosion. The top threads are NPT (tapered) and bottom threads are NPS (straight).

Key Features

• Eliminate dangerous thread mismatch when in-line valves are screwed onto thru-hulls
• Accept standard thru-hulls into the base and standard in-line valves on top
• Provide a safe and sturdy assembly when in-line valves are used as seacocks
• For OEMs, prevent valve damage during engine or generator installation—the valve can be installed later
• Simplifies future valve replacement
• C83600 bronze for corrosion resistance
• Complete with bonding screw and eye for safety tie