The use of Yale pressure gauges is recommended when the operating pressure (the force of the connected cylinder) should be monitored. Yale pressure gauges are equipped with a stainless steel housing and an acrylic plastic face cover plate. To absorb pressure shocks gauges are glycerine-filled, thus contributing to a long service life. Also, when fitted to a motor pump, the pointer will stay jitterfree. This pressure gauge adaptors are suitable for connection to all HPS and HPH hand pumps. Gauge connection with sleeve nut and 30 degree angle for easy reading.