4" PVC IPS Gasket Joint Spigot Adapter (G x Spigot) - The Drainage Products Store
Spigot adapter TVMP - bale block
Fyydes 3pcs 1/4 To 3/8in Male Threaded Screw Adapter Spigot Stud Convertor Copper For Camera Tripod Studio Light Stand,Spigot Stud,Spigot Stud Convertor - Walmart.com