This unit is primarily designed for ponds that have "Non Standard" Bottom Drains, i.e. large sumps and / or domes or no stems. Again a shrink band secures the membrane to the backing plate.

The aerator assembly fits to the customer's dome via a hole cut through the centre of the dome and sits on a "make up" piece, which is provided to fill the space between the aerator and the dome.

The complete assembly is secured with a stem, as shown, or with an adapter manufactured to the customer's requirements. In both cases, the stem or the adapter provides the air inlet. The air inlet is via a nickel plated connector.