Amazon.com: TAILONZ PNEUMATIC 304 Stainless Steel Male Elbow - 3/8 Inch Tube OD x 1/4 Inch NPT Thread 90 Push to Connect Tube Fitting PL-3/8-N2 (Pack of 2) : Industrial & Scientific
1/2"1/4"3/8"3/4"1"2"Female x Male Street Elbow Threaded Pipe Fitting Stainless Steel 304 - AliExpress
Smith Cooper 3000# Forged 316 Stainless Steel 3/8 in. 90° Elbow Fitting - Socket Weld - John M. Ellsworth Co. Inc.