Tri-Clamp Direct Drive MixersTri Clamp Direct Drive Mixers 3 4 HP Air Direct Drive Tri Clamp Mixer, (1) 4" PRL, 1" x 28" Exposed, Comp Mech Seal 3 4HP Shaft Length: 28" (From bottom of Tri clamp) Air inlet port: 1 4" NPT Air adjustment valve to control speed Requires 30CFM @ 100 PSI air supply 3 4 HP Variable Speed Electric Direct Drive Tri Clamp Mount Mixer 3 4 HP 115V Power supply Shaft Length: 28" (From bottom of Tri clamp) 1 HP XP Direct Drive Tri Clamp Mixer, Mech. Seal, (1)