Guardian 1/4 in. x 5 in. S80 304/304L Stainless Steel TBE Nipple Seamless E4BNB09 - The Home Depot
Anvil International 325 Steel Pipe Fitting, Schedule 80, Seamless Nipple, 1/4" NPT Male x 1-1/2" Length, Extra Heavy Black Finish: Industrial Pipe Fittings: Amazon.com: Industrial & Scientific
Pipe Fittings Direct. 4 inch 304 Stainless Steel Schedule 80 weld on Straight Tee