Other threads are available with the use of adapters. The engine and pump are coupled with a stainless steel quick release clamp via a speed increaser drive. The belt/pulley design requires no maintenance or lubrication and has proven very durable and quiet. The manual pump priming system is designed with ease of operation and simplicity. The pump can be primed before starting the engine, avoiding possible complications due to a lack of water in the pump. The pumper is a high performance design. Pressures of up to 420 PSI and flows of up to 110 US GPM can be achieved. It has a low weight of 137 LBS in the standard configuration and, depending on the choice of frames, places this unit in the portable class. There is a choice of standard frames consisting of a hand carrying type or a channel base. The unit can also be mounted directly to a truck or trailer. Non return discharge check valve