Harrington Inc., “Forged” Storz heads provide maximum strength. Harrington Storz are rated for a working pressure of 250 PSI. No hidden imperfections like those found in cast couplings. Hard coat anodizing to Military Specification, Type 3. All female swivels utilize stainless steel ball bearing or aluminum roller bearings, no plastic. Available 2” to 6”. All Storz couplings 4” and larger includeAll Metal NFPA compliant lock.