Halkey-Roberts Valve Adapter that fits Thurso SUP. The pump side of the adapter has an 18 mm I.D. that allows most pump hoses to be inserted with a snug fit. The wall of the pump side where the hose is inserted is thicker than that of adapters usually included from Thurso. There is also no seam. So, the adapter will not split over time from the pressure of inserting the hose like the stock adapters do.

Model made using FreeCAD 0.21. This was my first project using FreeCAD. So, apologies for the non-elegant design!