Zurn PEX XL-Low Lead Brass Barb x Barb Lever Handle Ball Valve. Manufactured from Eco Brass, C69300. These fittings, as a system with Zurn PEX tube, are pressure rated at 160 psi at 73��F, 100 psi at 180��F and 80 psi at 200��F. These fittings are listed as complying with the following standards: NSF/ANSI Standard 61 including Annex G and CSA.