Mine broke last summer, I couldn't believe what KTM wants for a replacement! And they charge for each end, both male and female.
So I ordered mine from Justgastanks.com after I couldn't source one locally, the same damn thing (only white) at half the cost.
I'm pretty sure this is the one I got and you want: 5/16" with dual shut-offs (but double check the hose size, I'm just going from memory):
Same damn thing, down to the factory markings.