Aluminum PE-to-PVC Transition Coupler for 2-1/2" SDR smooth-wall polyethylene duct. Designed to connect polyethylene duct to standard IPS metal or PVC pipe or fittings. Air tight to 180 psi with high pullout strength. Right-hand threads on the PE end; NPT female pipe threads on the other end accept a male NPT to female PVC pipe adaptor. PVC pipe is glued into the female end of the adaptor. Custom sizes can be made.