GF30 - Conical Fermenter self sealing coupler BSPP 3/8", also called G3/8. It's parallel BSP (BSPP), not tapered BSPTSeal specification: ID-9mm OD-16mmSKU10060 Related articles GF30 Conical Fermenter Dual Valve seals diagram GF30 Dual Valve Liquid Inlet Sizes What is the size and thread type of the ball valve at the top of the pump on a G30³ Product Guide to the G & S Series Video - Quick Overview of the Whirpool Aeration Paddle