Perko Gas Tank Vent w/Swivel ElbowThis Perko gas tank vent sits at a 90 angle made of zinc alloy, with a black polymer cap. It also includes a removable 30 mesh stainless steel wire screen flame arrestor. The design of this ventilator allows the elbow to rotated to any position you need. Specifications: For hose size: 5/8"; Maximum hull thickness: 3/4"; Click here for Perko Gas Tank Vent with Swivel Elbow