STM A860 WPHY 65 Barred Tee,MSS SP 75 C&N is a professional manufacturer of high-strength butt-welding fittings. We supply ASTM A860 WPHY 65 Barred Tees that meet MSS SP-75 specifications and offer NACE MR0175 compliance for sour service applications. These barred tees provide reliable performance in high-pressure pipelines requiring pigging operations. ASTM A860 WPHY GR 65 Pipe Fittings, MSS SP 75Download A barred tee is a specialized pipe fitting with internal restriction bars welded across the branch outlet. It prevents the pig from entering or getting stuck in the branch line while allowing smooth passage through the main pipeline.