I haven't used that reg before, but solenoids do typically attach to regulators.
If the solenoid does attach to the regulator it will be the connector on the solonoid that is on the bottom of the picture you posted that connects to the regulator. Do they seem to have compatible attachments/threads? If you are able to attach it do some good leak testing on it (paint diluted waashing up liquid on it, and leave for several hours while it's going).
I think this is quite a popular regulator with forum users, so you'll probably get some more helpful and detailed feedback soon.
Best regards,
Mark