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316 Stainless Steel, 2 in x 2 in Fitting Pipe Size, Coupling - 6JK73|60FC111N020 - Grainger
Matco-Norca 1 in. x 4 in. Schedule 40 Welded Stainless Steel Nipple Fitting SSN304054 - The Home Depot
Water Treatment Equipment Accessories Reverse Osmosis Clamp Seal Ring Stainless Steel Pipe Clamp Coupling - China Water Purifier, Rigid Flexible Pipe Coupling | Made-in-China.com