Structural Fibers Ecowater Systems Water Softener. (5) cylinders,TSRP glass material in a random configuration. (1) 12 in. D X 48 in. L cylinder with a max operating pressure of 150 psig and a max. Temperature of 120 °F. This cylinder was tested under NSF std. 44. (4) 11 in. D X 44 in. L cylinders with max operating pressure of 127.5 psi and a max temperature of 120 °F. These cylinders had a hydro test to a pressure of 300 psi. Overall dimensions are 36 in. l X 27-1/2 in. W X 64-1/2 in. H.