AOK Liquid Filled Hydraulic Diaphragm Pressure Gauge Monitor / Tester for Water Filtration System/reverse Osmosis (Ro) Water Pressure- 150 PSI Stainless Steel Hydraulic Gauage 2.5" 1/4" Thread, 10Kgs/cm2:150psi 1/4" FNPT Manual flush Valve & 1/4 Quick OD Manual Flush Valve Made in Taiwan / Assembled In USA Liquid Filled Diaphragm Pressure Gauges