Just made up these hokey expansion plugs to leak test my 6 headers/heat exchangers. The big one has an air fitting. Worked like a champ - Put 25 psi on them submerged in the bath tub (wife was at work)

Anyone need them, let me know. Freebie if you can use them and agree to pass them on

I would like to check my new HE's out with these plugs. I'm also in the 'burgh too in Sewickley at night and Monroeville during the day. Are you anywhere close by?