... Housing for Reverse Osmosis System1) Diameter: 8" 2) length: 1 , 2 ,3 ,4 ,5,6,7 membrane element 3)Max working pressure: 300PSI4 ... Test: 450psi7)Operating temperature range: -7celsius degree to 49 celsius degree (20°F to 120°F)8)Burst pressure :1800psi9)Operating pH ... range:3-1110)Cleaning pH range:2-12(less than ...