3 Way Ball Valve Maker: 3 Ways Ball Valve, T Port, L Port, SS 304, 304L, PTFE, PPL Seat Seal, 1/2-8 Inch, 150-300 LB, Flange, Reduce Port, API 6D. The three way and four way ball valve have an L-shaped or T-shaped hole through the middle. It is easy to see that a T-port valve can connect any pair of ports, or all three, but in the 45 degree position all three ports might be disconnected. The L valve can connect the center port to either side port, or disconnect all three, but it cannot connect the side ports together. https://www.uvalve.cn/3-way-ball-valve-t-port-l-port-1-2-8-inch-150-300-lb.html