Air Diaphragm Pumps - Stainless Steel - Hygienic
HD Process supply a range of hygienic stainless steel pumps with Tri clover connections.
Commonly these have toggle clamps for quick access opening and cleaning.
See photos here and PDFs below related to the P1 (1/2 "), P2 (1"), P4 (1.5”) , P8 (2”) and 3” Wilden (metal) pumps.