Tetra air stone. The Tetra air stone is fine-pored and therefore an even air vent with a long-lasting, high-quality finish. The combination with Tetra APS aquarium air pumps is ideal and despite full use of the pump performance, the pressure resistance is very low. At the same time, the Tetra air stone is the optimal solution for optimal oxygen supply to your aquarium. Available in 4 sizesAS30 = ø15mm / length 30mmAS35 = ø23mm / length 35mmAS40 = ø27mm / length 40mmAS45 = ø30mm / length 45mm

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