Pond One Prefilter Sponge with adapter – 11006, The prefilter sponge is a larger sponge than standard. This allowing a larger water intake area reducing the stress on your pond pump. For use on smaller pond pumps remove the larger adapter to reveal the smaller thread. Size 450 x 160 x 160mm

Just remove your existing prefilter cover & sponge and screw the adapter straight on to your pump!!