Gloxco Aluminum Type DA Cam and Groove Hose Fitting, 90 Degree Elbow, 3″ Female Camlock x 3″ Male Camlock (CAM-30-DA90-AL) - Walmart.com
Ironwerks Designs 3/4 in. X 6 in. Sandblast Iron Pipe Nipple (10-Pack) IW-NPLE-SND-3/4x6-10 - The Home Depot
Amazon.com : NRC&XRC Pair of 316 Stainless Steel Bimini Top Hinge Rail Mount with Boat Pin & Cam Clamp Quick Release for 7/8" Tube/Pipe : Sports & Outdoors