The HM37 Five Valve Manifold combines two shutoff valves, two equalizing valves, and a vent/calibration valve into a single, compact assembly. Accuracy is paramount in the upstream and downstream hydrocarbon measurement world. When expensive liquid or gas changes ownership, precise measurement is critical. The larger 3/8" bore smooths out the transmission oof primary element pneumatic signals by reducing pulsation induced spikes to the transmitter improving accuracy The smallest leakage from the high side of the manifold to the low side can lead to lost revenue due to inaccurate measurement. The double equalizing arrangement ensures against measurement error that can occur from equalizer leakage between high and low pressure connections, making the HM37 ideal for custody transfer applications.