1-1/2" #316 Stainless Steel NPS to NPT Flange AdapterIBVF Flanged Adapters have been developed to address several common problems in the marine industry.  Features:  Eliminate dangerous thread miss-match when in-line valves are screwed onto thru hullsAccept standard thru-hulls into the base and standard in-line valves on topProvide a safe and sturdy assembly when in-line valves are used as seacocksFor OEMs, prevent valve damage during engine or generator installation - the valve can be installed laterSimplifies future valve replacementC83600 Bronze and #316 SS models