SL90 / SL135 / SL450 / SL550 water drilling swivel parts for rig with follows features:

1,The washpipe and packing assembly is of cartridge type and can be replaced on the drill floor without disconnecting the rotary hose and the gooseneck.
2,The contact surface radius of the bail conforms to API 8A specification.
3,Expendable parts have good interchangeability.