Part No. 77-0040.RD (oro2u.com)
WIRTZ GAS STOP(RED)
One way valve for fuel tank vent hose. Doesnt let fuel spill out, yet still allows air into the fuel tank. A similar valve is standard on the WR model Yamaha. The Wirtz Gas stops are available in 4 colours: Blue, Gold, Platinium and Red.

WIRTZ VEN-RD