Other threads are available with the use of adapters. The engine and pump are coupled with a stainless steel 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 for 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 up to 215 psi and flows up to 140 US gpm can be achieved. It has a low weight of 117 lbs (53kg) in standard configuration and, depending on choice of frames, places this unit in the portable class. There is a choice of standard frames consisting of a hand carrying type or channel base. The unit can be mounted to a truck or trailer. A 1½" non return check valve is available..