gas line on space bound architecture

i read about an idea
all gas lines leak
solution have negative pressure in the lines
so air would leak into the line instead of out

although this is an alright solution
it does not adress the problem
could we use magnetic locks for the presurized systems
considering magnetic fields definatly
affect plasma
then it would hold the gas (hydrogen for instance)
in the field at a connector point through magnetism
is this possible or is the field needed to strong to
be of use on the station
IE heat managment from the added use of eectricity