This simple device will save your office hundreds of dollars every year...many times there are impression material cartridges that are two-thirds empty.  That not enough for another impression but too much to discard.  Eliminate leftover material waste by transferring unused, good impression material from partially filled tubes into one tube.  Just snap onto cartidge flanges. Five reusable plastic impression cartridge transfer connectors to transfer unused material from several partial tubes and refill one tube.  Each connector can usually transfer an entire batch of cartidges at a time.  For use with rounded-flange high performance auto mix cartridges. Package of five.