Zurn® PEX® XL- Low Lead Drop Ear Elbow. The QQDE_BFGX is used to connect PEX to FPT drop ear elbow. 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.