I am going to ask : Where is the leak?
The stem of one or both valves: Replace it or re-cartridge the valves (Replace the valve part)
The round thing on top. Is a seperate device and can also be replaced way less expensive than the entire fixture (it is a backflow prevention device or Vacuum breaker, any RV store should have them in the proper (1/2") size.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times