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Amazon.com: TAILONZ PNEUMATIC 304 Stainless Steel Male Elbow - 3/8 Inch Tube OD x 3/8 Inch NPT Thread 90 Push to Connect Tube Fitting PL-3/8-N3 (Pack of 2) : Industrial & Scientific
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Stainless Steel Tube Fittings AN Unions - 3/4"T x 3/4"AN
Stainless Steel Compression Fitting Male Connectors - 3/4"T x 1"NPT
3 4 6 8 10 12mm 1/8 1/4 3/8 1/2 Pipe OD Tee 3 Way Double Ferrule Tube Fittings T-Type 304 SS Stainless Steel Pipe Connector - AliExpress
Matco-Norca 3/4 in. X 3-1/2 in. Schedule 40 Welded Stainless Steel Nipple Fitting SSN30404312 - The Home Depot
18L & UNF 3/4''-16 Zink plated Steel Straight Cutting Fitting with Male Threads 315 bar ISO 8434-1 | Tameson.com