After use sometime, the liquid oxygen nitrogen argon pump could have some liquid leakage.Why this leakage happen. There have two reasons：
First, tight the copper bolt at end of the liquid oxygen nitrogen argon pump head end.
Like the following photo:
Mark: it must wait the pump head change into normal temperature.and tight one circle. Then check whether pump leakage. If the pump not leakage, you just leave copper bolt in that situation.
Second, after the copper bolts finished the gap to the pump end and pump working more than one or two years, you could change the inside of the pump heads spare parts.The liquid oxygen nitrogen argon pump head spare part list as follows:
