he PH-2 Series Proportioner by Polyurethane Machinery Corporation (PMC) is the newest generation in hydraulic proportioners. Offering high value and superior performance, at an entry-level price. The PH-2 Proportioner is ideal for use in residential foam applications and coatings such as; bed liners and containment pipes - as well as large interior, exterior, residential, commercials, and industrial spray foam applications.