Amazon.com: Horiznext NPT 1" male thread to 1 inch O.D. barb stainless steel pipe fitting, for connecting 1 inch I.D. air hose tubing, pack of 2 pcs : Industrial & Scientific
SteelTek 1-1/4-in Structural Galvanized Rail Support in the Structural Pipe & Fittings department at Lowes.com
4PCS Hex Nipple 1" Male x 1" Male Pipe Fittings, 304 Stainless Steel 1 inch NPT Male Threaded Pipe Adapter Fittings Equal Nipples Connectors, Male Straight Connector Pipe Fitting - Amazon.com