This is a triplex [three piston] positive displacement, reciprocating, plunger pump, constructed of a forged brass manifold, 304SS valve assemblies, solid ceramic plungers and standard NBR [Buna-N] seals and o-rings. This pump comes complete with a Gearbox attached for direct mounting to a gas engine drive. [See Gearbox/Motorized Units - 8076-8077 Data Sheet]