The PROLINE AQUA 4" Aerated Bottom Drain Including Direct Air Feed For Koi Ponds P - 43.24 making them the best choice

making them the best choice for koi ponds and indoor pools that are used all year round

Can now also be used as 'standard' dosage pump thanks to the external control function

1 x Screwdriver for calibration

This unit completely replaces the "Standard Bottom Drain" The most noticeable feature is the extra connection in the sump of the drain

The PROLINE AQUA 4" Aerated Bottom Drain Including Direct Air Feed For Koi Ponds P - 43.24 making them the best choiceThe PRO Line Aerated bottom drain has a solid 1 inch air feed and at no point requires you to use flexible pipes to connect air inside the drain; just simply connect 1 inch pressure pipe to the side of the drain and run parallel to the main 4 inch drain pipe. The highest quality 250mm Gummi 'Jager' diffuser. Uses a 1" air feed directly to the diffuser, eliminating flexible pipe. The diaphragm can handle 150 litres; we recommend between 40 80 litres.