2" Finger-Type Piston Cup Expander

• For use with 21-1 leather pistons in 2" diameter bulk guns.
• The most economical way to reduce leakage or blow-by in a bulk gun.
• When placed inside the face of a piston cup, below the small steel washer, it creates a tighter seal against the inside of the gun barrel.
• For full kit see 47-13