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 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 G30³ - Anatomy Diagram & Parts List