The Weldmart (Profax) spool gun is a direct connect gun for Miller CP power supplies with the standard 14 pin connector. The basic spool gun design has been on the market for over sixty-five five years. It will push wire for 0.025 the 1/16 wire adn any alloy you can get on a standard 4" spool, no proprietary wire spools nobody stocks. Standard straight and 45' barrels are avaiable. We can provide special order barrels. You tells us what you need-your the customer!