1st Design Has No O-Ring Between Piston Ring & Piston. 2nd Design Has An O-Ring Between Piston Ring & Piston. 1st Design-No O-Ring Between Piston Ring & Piston. 2nd Design-Has An O-Ring Between Piston Ring & Piston.
PINION & SHAFT; All Models. PINION & SHAFT; All Models; w/STE. VALVE RING SEAL KIT; All Models. VALVE RING; All Models. VALVE RING; Beretta, Corsica. VALVE RING; Seville.