Home - TSI Flow Products flowline, integral flowline, n.p.s.t, 1502 adapters, 1502 fittings, plug valve, gate valve, choke, adjustable choke, positive choke TSI Flow Products manufactures both custom designed and off the shelf plug valves, choke valves, gate valves, and flowline as well as a wide assortment of flanges and fittings for …