choke and kill manifolds 1Drilling spools made the connection between the wellhead equipment, the blowout preventers stack and choke and kill manifold.

Top and bottom flanges, according to API 6A: 21 1/4″, 20 3/4″, 16 3/4″, 13 5/8″, 11″, 9″, 7 1/16″ Flange outlets, according to API 6A: 4 1/16″, 3 1/8″, 3 1/16″, 2 9/16″, 2 1/16″ Maximum working pressure: 2000 psl (140 bar) to 15000psl (1050 bar)