Compressor outlet flange, with O-ring and quick release clamp. Fits Borg S400/S500, PTE pro mod, Garret G(GTX) Series 42,45,47,50,55,57 V band discharges with a 4.21″ (106.94mm) OD machined face. Made from 6061 aluminum. Will work with 3" Tubing, 3.5" Tubing, and 4" Tubing