Abstract: An apparatus for handling substances which are rendered fluid by heating, such as wax, the apparatus including a body defining a chamber having opposite walls and a filter therebetween separating the chamber into a liquid chamber and an air chamber, openings for introducing air into and withdrawing air from the air chamber, openings for drawing liquid into and ejecting liquid from the liquid chamber in response to the respective withdrawal and introduction of air into the air chamber, a resistor in the liquid chamber for maintaining substances therein liquid, the resistor being housed in a tube extending between the walls and through the filter having at least one bore for placing the tube in fluid communication with the liquid chamber, a hand piece, a duct in the hand piece, and a part of the resistor and a short tubular element maintaining the body and hand piece in coupled but readily decoupled relationship.