Amazon.com : Neewer 2 Pieces Standard 1/4 to 3/8 inch Metal Male Convertor Threaded Screw Adapter Spigot Stud for Studio Light Stand, Hotshoe/Coldshoe Adapter, Ball Head, Wireless Flash Receiver, Trigger : Electronics
Orbit 1/2 in. Drip-Lock Hose Faucet Adapter 67495 - The Home Depot
Walimex pro Spigot Adapter 5/8"-11/16" – Thomann United States
Spigot adapter TVMP - bale block
6540-262 3/4" Barb x 3/4" Spigot Adapter (Qty. 2)
Impact Double Flat-Edge Spigot Adapter CA-119 B&H Photo Video
Threaded Faucet Adapter with Hose Nipple - Kegco
Manfrotto 119 Short (16mm) Adapter Spigot with 1/4"-20 & 3/8"