well firstly a double gauge regulator is a must really, well for me anyway. One gauge recommends how much is in the gas tank and the other regulates how much PSI you are putting into your system.
With the leaks, you should use hose clamps on all of your connections, keeps all leaks out. Also check all of your seals on your kegs and couplers, gas easily leaks out there. make sure the regulator is also connected to the gas bottle properly, check the pressure relief valve on the regulator also, could be faulty
Your taps should be cleaned after every day of using them, I just put a glass of hot water over the tip before at the end of drinking, saves beer drying out
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