Wilden 2" air operated double diaphragm pump stainless steel teflon
2" pump teflon diaphragms and balls (fitted with rubber seats, they should really be teflon to match the rest of the pumps configuration) easily swapped over and not an overly expensive part
4 Rubber seats 4 Teflon balls Teflon diaphragm.
Versa-Matic manifold (head and tail). versa matic parts are interchangeable with wilden
Also has 2" inch flange adapter.