
Spare Parts TYP 2389
AR 303 - AR 403 O-Ring Kit
O-ring kit for the AR 303 and AR 403 pumps. It supplies the seals that are disturbed when the pump heads, manifolds and covers are removed for valve or diaphragm work. Reusing old O-rings after a service is the usual cause of leaks and air ingress, so fit this set whenever the pump is opened.




