If your pump head is leaking, it is likely due to worn seals. If you purchase a pump from us here at onestop, you can rest assured we have the spare parts with expert advise on how to replace these seals.
This is almost always an unloader valve problem, if you purchase an unloader valve from us here at onestop, you can rest assured it is a high quality compatible part.
This is almost always check valves, they create vigorous vibration when they are worn out. You can rest assured that here at onestop we have the spare check valves for any of our pumps.