【INSTRUCTIONS】 : Put the head of the water changer tube submerged in the water, move it up and down to produce pressure in the tube, then the water will automatically flow through the hose due siphon effect. 【SOFT HOSE】 : The long and soft hose is made of pvc, environmentally friendly, non-toxic and flexible. 【HEAD DESIGN】 : The special tube head design makes it easy to manually change the water in the aquarium. 【MANUAL WATER CHANGER】 : Manual water changer is designed to change water, clean small gravel and remove droppings at ease. 【CLEAN FISH TANK】 : Our aquarium manual water changer siphon tube is suitable for cleaning small size aquarium fish tank. Features: Condition: 100% brand new Material: PVC Color: as shown in the picture Fit for: Small size tank Tube Head (L x Diam.): Approx. 17.4 x 2.8cm / 6.85 x 1.10inch Long hose length: approx. 150 cm Weight: approx. 88g Package included: 1 x long hose 1 x tube head Note: 1. Put the tube head immersed in water. 2. Move up and down to