Mazzei CR-2 Injector Check Valve Repair Kit **Only Online Authorized Distributor of Mazzei Ag Injectors** Replacement parts for check valve assemblies Includes Teflon ball, Kel-F seat and Hastelloy-C spring Fits 1/2 and 3/4 inch Injectors Please visit www.mazzei.net/venturi_injectors/ for more detailed information