Maxi 310 i think

[nuggitmv]

Hi all i have bought my self a maxi 310 chiller after building a man cave tap room i have 3 taps to run through the 4 lines on chiller question is the JG fittings i have that come with it fit on to it nice and tight one way not the other and the 3/8 beer line leaks the other dose any one know the right size or type i should be used