| Fluid Cap/Manifold | Center Section | Seat/Ball Material | Diaphragm Material | Air Section Service Kit | Fluid Section Service Kit | Fluid Connection | Weight lbs (Kg) |
| Aluminum | Aluminum | Santoprene / Santoprene | Santoprene | 637397 | 637401-AA | 1" N.P.T.F. | 25.30 lbs <br>(11.48 kgs) |
| Aluminum | Aluminum | Aluminum / PTFE (PTFE) | PTFE (PTFE) w/ Santoprene backer | 637397 | 637401-TT | 1" N.P.T.F. | 25.30 lbs <br>(11.48 kgs) |
| Stainless Steel | Polypropylene | 316 Stainless Steel / PTFE (PTFE) | PTFE (PTFE) w/ Santoprene backer | 637397 | 637401-TT | 1" N.P.T.F. | 38.2 lbs <br>(17.3 kgs) |
| Stainless Steel | Stainless Steel | 316 Stainless Steel / PTFE (PTFE) | PTFE (PTFE) w/ Santoprene backer | 637397 | 637401-TT | 1" N.P.T.F. | 49.29 lbs<br> (22.36 kgs) |
| Cast Iron | Aluminum | Santoprene / Santoprene | Santoprene | 637397 | 637401-AA | 1" N.P.T.F. | 39.85 lbs <br>(18.08 kgs) |
