Amazon.com: 20Pack 1/2 Inch PVC Nipple Male Thread Coupling Adapter Connector (Male x Male) 1/2" PVC NPT Male Thread Coupling Pipe Fitting for Thread plumbing Pipe, Home or Industrial Use, Schedule 40 :
Pneumatic Manual Male Threaded Coupler - DC2103
uxcell 1 1/4"PT Male Threaded 40mm PVC Pipe Straight Connector Coupler White - Amazon.com
Uxcell G1 Female x G3/4 Male Thread 31mm Brass Pipe Fitting Hex Coupling 2 Count - Walmart.com
PVC Water Pipe Straight Threaded Nipple Socket Male x Male Pipe Fitting 20-63mm | eBay
3/4" inch NPT male thread Union split Coupling Pipe Fitting stainless steel 304 | eBay
PPR Male Threaded Coupling, For Pipe Fitting, Size: 2inch
52-C (66 mm) Stainless Steel Storz Coupling G 2'' Male Thread | Tameson.com
1/2" Male to Male Threaded Half Threaded Coupling | Half Coupling | StillDragon
Megairon 3/4" NPT Male x 3/4" NPT Male Threaded Coupling,Stainless Steel SS304 Cast Pipe Fitting,Nipple - Amazon.com
Male Threaded Coupling 1-1/2" MPT - Aquascape, Inc.
Buy Wholesale China Male Threaded Coupling, Stainless Steel En 14420-5 & Male Threaded Coupling at USD 1.8 | Global Sources