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Economy version of the Hiblow HP-40A, the Hiblow XP-40A air pump ensures the proper operation of aerated septic systems. Its continuous air flow to fine bubble diffusors or similar equipment provides a stable aerobic environment for effective wastewater treatment. This model includes an alarm to signal any failure or when the pressure drops below 1 psi. Compatible as a replacement for other aerators that produce 40 L/min.