Valves designed for use with plastic or metal tanks Perko's patent pending "In-Pipe ICV" fits inside the pipe itselfIn-pipe ICVs mount inside standard 1-1/2" fill pipes near the connection to the fuel tankEliminates the need to retool existing doghouse on plastic tanksReplaces in-line ICVs, eliminating 4 hose clamps & 2 leak pointsAllows for full 18 GPM flow rates