"Larson", I would think Ag Chem Solutions would export for the right price.
The handle itself is available from that company to bolt onto the bolted 2” or 3” valve/coupler you may already have.I'm tempted to order one for my self.Part no: VSBHB305FP - $169.36 - Eliminates multiple fittings for fill applications. Available in 2" & 3" sizes. Full flow design.shop.farmchem.com
We have similar set up at moment filling a Horsch 5lt , the 3 inch arag valve is quite a lump and how ever we position it it doesn't seal 100%, needs a 3 cam lever camlock I think, which I see is available but only in a NPT fitting not BSP.