6pcs Spigot Stud Adapter Male Convertor Threaded Screw Standard 1/4 to 3/8 inch Metal for Hot Shoe/Cold Shoe/Studio Light Stand|Follow Focus| - AliExpress
Irritec Male Hose Thread x Socket/Spigot Adapter-Size:3/4" MHT X1" Socket/1-1/4" | eBay
90 deg. Elbow Spigot Adapter Spigot x Insert - AquaCave.com
Manfrotto Spigot Adapter 16 to 17mm 185 B&H Photo Video
Spigot Adapter Spigot x Insert - AquaCave.com
Amazon.com : 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
SaveAqua Tap with Spigot & Hose Adapters - SaveAqua