Amazon.com: JoyTube 1/4" Male to 1/4" Male NPT Hex Nipple 304 Stainless Steel Threaded Pipe Fittings (Pack of 5) : Industrial & Scientific
Iron / Galvanized Fittings - Fittings - Ace Hardware
Cast Iron Pipe & Fittings at Lowes.com
Everbilt 1/2 in. FIP 90-Degree Elbow Fitting, Stainless Steel 860530 - The Home Depot
Pipe Fittings Manufacturers and Suppliers in the USA
Maker Pipe | Structural Pipe Fittings for DIY Builders
Beduan Shower Head Extension Tube Pipe Fittings, G 1/2 Male to G 1/2 Female BSP threaded Stainless Steel Round Shower Arm Extension Cast Fitting Coupler (50mm Length,Pack of 2) - Amazon.com
SteelTek 1-1/4-in Structural Galvanized Rail Support in the Structural Pipe & Fittings department at Lowes.com
9 Cool Projects You Can Make with Pipe and Fittings - Bob Vila
The Plumber's Choice Black Steel Pipe, 3/4 in. x 12 in. Nipple Fitting (4-Pack) 3412NPBL-4 - The Home Depot