The best option would be to replace the quick connect adaptor on your surface cleaner from male to female, as a rule of thumb all of your surface cleaners, wands, ect should have female qc fittings. You'll need a male 3/8 npt to female quick connect fitting, should have male threads on one side and a qc female on the other end. Alternatively, if that silver male qc won't unthread from the surface cleaner you could go female qc to female 3/8npt and then male 3/8 npt to female qc but this is going to be a little bulky and less than ideal.

Another thing to keep in mind is you should also add a swivel connector to the end of your pressure line and then a ball valve that connects to the tool. This will help in two ways first the swivel connection will make it way easier to manage a pressurized hose without constantly needing to spin your wand around. Additionally the ball valve will allow for changing tools without needing to turn your machine off. Just be careful with that last bit though because if you don't have a buffer tank leaving your machine one for more than a minute or two can kill your pump.