Viton O-ring repair for those leaky old British Seagull Ewart's petcock corks.  Developed by Dr. A.E.  These unique petroleum and ethanol resistant Viton o-rings are a direct replacement for the corks on plunger type Ewarts fuel taps fitted to most British Seagull outboards up until the late 1970's. Fitted in minutes with no need to remove the valve body from the tank or tank from the motor. No need to modify, drill, or machine the original stem. Simply cut off the old cork and push the O-rings onto the valve stem. Permanent and leak-proof repair. Contains everything needed to repair one petcock including full instructions. O-RINGS ONLY. DOES NOT INCLUDE VALVE