OTT STANDARD 2 tubular aerators can be installed in pairs or separately on stainless steel and plastic distributors with inner diameters of 30, 40, or 45mm. You can use ethylene propylene rubber (FLEXNORM) ®） Or silicone resin (FLEXSIL) ®/FLEXSIL ®+） The membrane obtained the Standard 2 tubular aerator. We provide different holes according to the requirements. You can obtain Standard 2-tube aerators with lengths of 500, 750, and 1000 mm at the factory. The special length can be between 200-1650mm.