PP1H and PP2H Peristaltic Pump Chemical Feed Prepackaged Systems . SELF PRIMING WITH BUILT IN SPILL AND LEAK PREVENTION The PP1H and PP2H (dual pump model) an ideal choice for hard-to-handle chemicals such as sodium hypochlorite, hydrogen peroxide or viscous polymers. Flow rates from .004 to 98 gallons per hour (with dual pump-head option.)