The Air-Trap P Series is a patented positive pressure waterless trap engineered for HVAC condensate removal in positive-pressure equipment configurations. It allows condensate to drain freely while sealing the system against air escape — a common failure mode of conventional P-traps in positive-pressure applications. The P Series is predesigned to eliminate field-design errors and operates dry between cycles. Meets IMC Code Section M307.2.4.1. Patent: US10605480B1.