The top male threaded fitting is 1/2" BSP that would be used to collect vapour from a distillation column.
The thinner elbowed tubing is an 6.35mm duotight compatible barb. Suitable for 6.35mm duotight fittings or 5x8 Silicone Tubing with a Hoffman clamp.
If you're looking for a complete kit with collection plates please see KL39659 - PolyPhoenix - Undertaker Collector Tee Kit
This is a 3 inch TC liquid or vapour collection plate made in 304 stainless steel. Designed to be used with the PolyPheonix Distillation range from KegLand.
It can however be used on any 3 Inch Tri-Clover Compatible fitting.