Amazon.com: AC Infinity 4" Ducting Take-Off Collar, Galvanized Steel Inlet Flange Starter Collar for 4” Ducting with Dryers and Range Hoods : Industrial & Scientific
Sukup 1.25" Two Hole Flange Bearing With Lock Collar - Stutsmans Ag Parts
Buy Wholesale China Cr #2500 Class A105 Rjt Weld Neck Flange Steel Collar Flange China Manufacturer & Weld Neck Flange,pipe Fitting,pipe Flange at USD 0.36 | Global Sources
Stainless steel DIN 11864/ DIN 11853 flange connections collar flanges - heco