You can save big if you decide to go with this scrap rubber hose
Need a double female Fire Hose adapter
Alternatively if a short length of pipe with two female National pipe threads (NPT) (in North American terms
Operate in extreme temperatures without worry -23 degrees F to 186 degrees F
Temperature Range
1.5" NPSH Female Pipe x 1.5" NPT Male Pipe Adapter DMH3025F You can save big ifChange Threads From 1. 5" NPSH Female Pipe To 1. 5" NPT Male Pipe Threads This is purely a female to male adapter designed to change threads without reducing diameter. It's one of the most popular and common way to change threads. Simply screw it on, and you're ready to go. Hook it into pumps, valves, hydrants, standpipes, & more. The NPSH female can fit into NPSH, NPT, IPT, NPS, PVC, Etc. The NPT male can fit into NPT, NPSH, IPT, NPS, PVC, Etc.