Style: Truss Ceiling Adapter - Black truss ceiling Adapter W/1. 5 npt, Black, QG-PRO-PM-TCA-B #QG-PRO-PM-TCA-B is compatible with all standard 1. 5" npt threaded pipes that weights up to 400Lb. This truss ceiling Adapter is capable to mount to any round, square, or rectangular truss and I-beams up to 3" (76mm) wide by 3. 5" (89Mm) high that uses heavy duty 10mm U-bolts. This Adapter works with qg-pro-pm-50-b or qg-pro-pm-50-w projector mount.