The second port has an internal check valve installed. This valve opens when a hose or gauge adaptor is connected to it. The APOG Pneumatic Pump is a high pressure pump with an integral test gauge fitting. The quick change swivel gauge fitting permits you to quickly match the gauge with the range being calibrated. The scissor handle design, low internal volume and micro-bore hose give you the advantage of higher pressure with less effort.
Gauges can be mechanical or digital in all standard ranges.
The HPGV pump is a high pressure pump with an integral test gauge fitting and a long stroke fine adjustment piston. Internal parts are brass, aluminum and stainless, with Buna N 'O' rings. The fluid reservoir is lexan. Oil, water and alcohol can be used with this pump. Check valves which may be easily removed for cleaning.