The HPDS is the heavy duty option on these AR pumps used in place of other versions of diaphragms AR550080 Gomma & the AR550081 Blueflex
Annovi Reverberi HPDS diaphragm suit the following AR pump used by Croplands
AR70, 115, 125, 135, 145, 160, 185, 250, 280, 370, 500
20 Bar Max
Price is for X1 Diaphragm only!