Proline Series 1/2-in x 1/2-in Threaded Male Adapter Nipple Fitting in the Brass Fittings department at Lowes.com
Amazon.com: Male Hex Nipple Threaded Reducer Connector Pipe Fitting Adapter,Stainless Steel 304 NPT (2" x 1-1/2") : Industrial & Scientific
1/2" 10pcs CPVC Male Adapter Fittings Coupling Male Thread to Slip (Socket)Beige (1/2 inch) - Amazon.com
Amazon.com: FangKingNo 2pcs 2Inch White 2-Way PVC Male Adapter Pipe Fittings (Slip to Male Thread) Coupling with 2-Inch Male Hose Thread Schedule 40 -2 Pack (2") : Industrial & Scientific
Ideal Vacuum | 2 inch ID NPT Male Coupler, nipple, 304 Stainless Steel, National Pipe Thread Male
Male to male thread coupling, ⅛" x ⅛"
Megairon 3/4" NPT Male x 3/4" NPT Male Threaded Coupling,Stainless Steel SS304 Cast Pipe Fitting,Nipple - Amazon.com
Plumbing Threaded Coupling - 1.5" Male Thread x 1.5" Hose Barb - Brass
2" IPS Compression x 2" Male Threaded Transition MPT - Hdpe Supply