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
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Heavy duty but compact design
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Solid plumbed air inlet piping to blowdown valve
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Single piece long life mud seal
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Soft coupling connection between Swivel shaft and Head shaft / spindle