Silent, yet powerful, air pump. Noise suppression chambers, long-lasting diaphragm, unique precision locking base. The innovative use of expansion chambers, curved casing and tight fitting base makes RENA AIR the quietest air pump yet. High pressure enables them to maintain optimum flow rate. UL and CUL approved. For 5-10 gallon tanks, 1 outlet. 2psi. Re-Engineered and Tune-Up Kit and Replacement Filters are now available.