✅ Made of PTFE, chemical resistant and high insulation. ✅ A side: ISO-KF25 / KF25 / NW25 /QF25 flange. ✅ B side: 3/4"-14 Male NPT tapered thread, follow USA standard. ✅ Pipe sizes do not refer to any physical dimensions. ✅ A 3/4" NPT pipe thread when you measure it. It is actually 1.050" instead of 3/4".