If you're connecting a Swiss hose to it, you can either cut off or disconnect the fitting and use a barbed fitting with a male NPT thread like this one:
Also, choose the barb to suit the I.D. of the hose.
Alternatively, use an MPT (the male version of NPT (National Pipe Thread) used in America) to BSP adapter and screw it into the regulator (fittings outside America seem to be pretty much all British Standard Pipe thread sizes).
Then you can screw a BSP push fitting onto the end and push that into the connector on your hose where the spray jet normally goes.
It's a good idea also to include a double check valve in your fixed plumbing or where the hose connects to a tap/faucet/spigot, so that dirty water doesn't siphon back into your indoor plumbing. This scenario can happen where water is turned off to the house during maintenance/outages, and the water in the pipes is drained when taps are run.
Make sure, and check with the manufacturer that the thread is definitely 3/4 inch before buying adapters. Some of their regulators seem to be 1/2 inch.
Edit: I've contacted the manufacturer to check whether the thread on the regulator is NPT or what's commonly known as garden hose thread (GHT). If so, you just need to search for GHT adapters/barbs instead of NPT ones.
Update: According to Valterra, threads are 3/4" GHT, so use GHT to BSP adapters.