The Metzke™ Dual Swivel HD is a combination air / mud swivel assembly, eliminating the need for a below head air swivel. The HD Swivel Shaft and bearings are isolated from Head Shaft Load through the use of a soft coupling between the shafts.
Key benefits of the Metzke™ Dual Swivel include
Heavy duty but compact design
Solid plumbed air inlet piping to blowdown valve
Single piece long life mud seal
Soft coupling connection between Swivel shaft and Head shaft / spindle