Thanks Russ, An old boy that is pretty familiar with this type of system kinda said the same thing. He said in the past he just drilled a 3/16" hole through the pipe plug and put a cotter pin in it. I was going to try that, them I saw a vented 3/8" pipe plug on ebay for 5 bucks so I splurged and ordered it today. I wonder if it had something like this originally? Thanks for the suggestion.