Leaky High side AC service port

Does anybody know if someone makes a cap or adaptor that could be used
to seal the core of the high side service port? I have a 96 Plymouth
Grand Voyager 3.3L with front and rear air. the AC isn't working very
good so while checking it out I noticed the high side port was
leaking. The core seems to be made out of rubber, and it's a big job
to replace the whole line. Thanks, Dave

 

It's proably just the schrader valve. You can get them for about 99
cents at any parts store.

 

A pack of 5 Schrader cores (including two plastic valve wrenches)
costs me $2.49 at United Refrigeration. However, if you want to
replace the valve with the system charged, then you're going to need a
Robinaire or Yellow Jacket core replacer tool, about $50 and up, but a
worthwhile investment if you're going to do even moderate service
work. Schrader cores, especially on the high side nearest the
compressor, harden and leak more often than not.

 

Thanks for the info, but like I stated this dosn't look like a normal
schrader valve. The low side looks like a normal valve. This is brown
and looks like rubber.