JEGS Billet Breather Clamps are designed to lock your existing push-in style breathers in place and eliminate separation under high RPM and high crankcase pressure situations. Features double o-ring inner and hair pin/set screw outer retention for flanged or straight style breathers. These clamps have adjustable snap ring retention for thickness and will fit stamped, sheet metal, or cast valve covers. Fits standard 1.25" hole valve covers and 1.22-1.25" push in style breathers (sold separately). Made in USA. 2/pkg.