This is an exhaust gasket set for the OS .20-25FP and 25LA engines. These gaskets are installed between the crankcase and a E-2030 muffler. INCLUDES: Three Exhaust Gaskets REQUIRES: Installation onto engine SPECS: Length: 38mm (1.50") C.D. between mounting holes: 1-5/16" COMMENTS: These gaskets are made specifically for a E-2030 silencer. kh01/14/02 ir/kh