Fluval AquaClear Power Filter Extension Tube; Available in 2 sizes AquaClear Online Price $7.48Regular Price $7.97 Small - $7.48 Large - $7.48 Quantity This variant is currently sold out Replacement Tube for AquaClear Power Filters Small size is for AquaClear filters sizes 20, 30, or 50 Large size is for AquaClear filters sizes 70 and 110