QUOTE(Valy @ Sep 24 2011, 07:33 PM)
That hole is originally plugged with a pressure plug.
Somebody removed the plug, tapped the hole and plugged it with a threaded cap.
You must measure the size and look for a new one. Usually, people use plumbing caps for this.
Yep... good call!
I just tried a 1/2" pipe plug and she went right in!
Somebody already tapped it for me.
That one was way to easy.