metal Quicksilver 6 gallon fuel tank, need a gas cap

[sdowney717]

I got tank for free, but gas cap is missing. filler has diameter of 1.5 inches, tang depth of 1/4 inch
Can I use an auto vented gas cap like this here, Stant 10623?
https://www.amazon.com/Stant-10623-F.../dp/B000B8JUH0

Original cap may have had screw down vent.

I dont know the tang depth of that 10623 cap.

 

[sdowney717]

Discovered a 6810 tank cap fits well this tank. It is a vacuum vented and pressure relief cap. The cap is used on hundred of trucks and cars.

Opens at 0.5 psi for suction and 2 psi for pressure is typical, so I bought on and will test the tank.
O'reilly has it too.
http://www.autozone.com/emission-control-and-exhaust/fuel-cap/cst-fuel-cap/4367_0_0/

http://www.oreillyauto.com/site/c/d...6810_1175510_3924&keyword=6810#itemDetailTab_