Strictly Attitude
Air-Valve Autobot!
You want total control of your air pressure that no mac valve can compare to this is the AB for you
http://www.ebay.com/itm/Antique-Bul...525?pt=LH_DefaultDomain_0&hash=item2ed9517b85
http://www.ebay.com/itm/Antique-Bul...525?pt=LH_DefaultDomain_0&hash=item2ed9517b85