Valves designed for use with plastic or metal tanks; Perko’s patent pending “In-Pipe ICV” fits inside the pipe itself; In-pipe ICVs mount inside standard 1-1/2″ fill pipes near the connection to the fuel tank; Eliminates the need to retool existing doghouse on plastic tanks; Replaces in-line ICVs, eliminating 4 hose clamps & 2 leak points; Allows for full 18 GPM flow rates