Marpac Two Piece Tracheostomy Tube Holder Collars - Bariatric, 2"x30" – Tri-Med Medical Supplies, Inc.
Testrite Instrument Co., Inc. | Aluminum Shaft Collar with Set Screw
Amazon.com: Set of 2 Split Collar Tube Clamps 2" I.D. - For Fabricating Bolt on Accessories like Light Bar Racks, Harness Bars, Roll Cage Braces, etc! [FAB-100A2] : Everything Else
Two-Piece Tracheostomy Collars | Medline Industries, Inc.
Z240 Pipe Collars | Abesco USA | Seal PVC, CPVC and ABS* pipes which penetrate thru 1 and 2 hour fire- rated concrete walls and floors | Tested in Accordance with ASTM