Here is a nice new RED pressure relief valve used with blowers/superchargers to relieve any pressure accumulated in the front gear cover.  This unit is in excellent new condition, RED anodized standard 7/16"-20 thread.   Made in USA

FREE SHIPPING

Note: Black anodized Valves are available on Ebay listing:   Pressure Relief Valve Blower supercharger FREE SHIPPING BLACK 7/16-20 USA | eBay

This valve can be used with most all blowers; Mooneyham, TBS, PSI, Littlefield, Bowers, BDS, Blower Shop, SSI, Kobelco, GM 6-71 8-71 10-71 12-71 4-71 3-71 etc.