Harrington Storz elbow adapters are rated for a working pressure of 250 PSI. Elbows are hard coat aluminum anodized to Military Specification, Type 3 then powder coated for a nice smooth finish. “Forged” Storz heads provide maximum strength. No hidden imperfections like those found in cast Storz heads. All female swivels utilize stainless steel ball bearing or aluminum roller bearings, no plastic. All Storz heads 4” and larger include All Metal NFPA compliant Storz-Lok.