​GROCO's IBVF Flange Adaptors are designed to address common marine installation challenges by eliminating hazardous thread mismatches between NPT in-line valves and NPS thru-hulls.They accept standard thru-hulls at the base and standard in-line valves on top, providing a secure assembly when in-line valves are used as seacocks.These adaptors also allow OEMs to install valves after engine or generator placement, preventing potential valve damage, and they simplify future valve replacements.Constructed from C83600 bronze.

• Eliminate dangerous thread miss-match when in-line valves (tapered NPT threads) are screwed onto thru-hulls (straight NPS threads). 
• Accept standard thru-hulls into the base and standard in-line valves on top. 
• By spreading the load across a greater area IBVF provides a safer installation 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