RBS carries a full line of Enderle square style barrel valve spools. Each spool has it's own unique idle slot and ramp so it is important to pick the proper one for your racing application. This spool is made from heat treated steel and includes O-rings so that when you install your spool there will be less of a chance for a leak with new O-rings installed. All spools use the standard serrated 5/16" linkage arm.
Barrel valve spool for blown gas will be stamped on the end of the shaft #12, blown alcohol #17 and #32 for tunnel ram applications.