Reciprocating plunger pump, 3 solid ceramic plungers, reinforced brass head, aluminum die cast crankcase, double sealing system, hardened steel crankshaft, oversize roller/ball bearings.
The pump PKD 4.0/25 U has a 1"1/8 hollow shaft, it produces a flow of 15 l/min, it operates at max 170 bar.
Some models are available with built-in unloader valve (and injector).
