Zurn® PEX® XL-Low Lead Brass Barb Elbow. The QQE__GX is used to make sharp 90 deg bends. Manufactured from EcoBrass®,C69300. These fittings, as a system with Zurn® PEX® tube, are pressure rated at 160 psi at 73 deg F, 100 psi at 180 deg F and 80 psi at 200 deg F.