Used on actuator hyd rty 3000psi 31700inlbs 180deg max. seal kit (22156-16) items included in kit (and quantity) include -- seal, cup (22156-16) (1) , seal, cup (22156-18a) (1) , seal, cup (22156-19) (1) , seal, cup (22156-19a) (1) , seal, cup (22156-20) (2) , seal, cup (not used in 22156 units) (2) , o-ring (22156-15) (2) , back up ring (22156-15) (2) , o-ring (22156-14) (1) ,