Removing V115 Yoke adapter from OMS tank

[KapitanSparrow]

I just got a used OMS tank with what appears to have a din/yoke valve with a V115 yoke adapter. Please see the attached picture. How do I go about removing the adapter? I tried to give it some push and it wouldn't budge. Does it normally take a lot of force to get it removed? Could it just be of old age and forever stuck. Am I destined to stick to yoke or getting a new valve?

 

[1bubbleoff]

Kappy-

Should be hex size 1/4" or 5/16th SAE...or possibly 7mm metric...turn counterclockwise...they can be QUIT tight.

Tell Maggy Hi!

Kurt

---------- Post added April 17th, 2014 at 09:49 PM ----------

gahhh...8mm EIGHT....( I need to drink moar!!)

 

[KapitanSparrow]

Hey Kurt,

So nice to read you. I will give the plug another try. Thank you. Will tell hi. Happy holidays!

Maciek