WATERRO MEMBRANE HOUSING MODEL: 4021-SS304 THREAD (300 PSI) WATERRO membrane housing 4021-SS304 THREAD (300 PSI) is a stainless steel membrane housing designed for standard 4" × 21" reverse osmosis membranes. The high-quality SS304 construction provides high corrosion resistance and a long service life. The housing is designed to operate at a maximum working pressure of 300 PSI and is equipped with threaded connections for secure installation. Technical specifications Parameter Value Product Stainless steel RO membrane housing Model 4021-SS304 THREAD Housing size 4021 (4" × 21") Compatible membrane Standard 4021 RO membrane Material SS304 stainless steel Housing type Threaded Maximum working pressure 300 PSI (20.7 Bar) Connection type Threaded Application Commercial and industrial RO systems Brand WATERRO Key advantages SS304 stainless steel construction Designed for standard 4021 RO membranes 300 PSI maximum working pressure High corrosion resistance Threaded connections Secure, watertight seal Long service life