The Walchem EZC21D1-VCA pump is now obsolete and the replacement model is the EWP-110DVC07A-USL pump. For reference, the obsolete EZC21D1-VCA specifications were:
Series: EZ
Max Output: 1.7 GPH
Max Pressure: 105 PSI
Pump Head: PVC
Valve Seats: FKM
O-Rings: FKM
Valve Balls: Ceramic
Diaphragm: PTFE (+ EPDM Backer)
Gaskets: PTFE
Tubing: ⅜″ OD PE (20′)
Options: Auto Degassing Valve installed under Manual Air Vent Valve
Electrical: 115 VAC, 50/60 Hz
Control Module: Manual Speed Adjustment from 1–360 strokes/min