Fluval Pull-Thru Hose Brush. As part of Fluval's complete line of cleaning accessories, the Pull-Thru Hose Brush is ideal for keeping all filter hoses and tubes clear for maximum water flow. Key Features : Helps maintain optimal water flow Cleans hosing and tubes (including most filter intake and output fittings) up to 36 in (90 cm) long and 5/8 in (1.6 cm) wide Brush measures 40 in (100 cm) L x 1 in (2.5 cm) diameter