Features, 

• Siphon can be clamped on to the glass for a hands-free water change. 
• Gravel / Sand cleaner can be added on for different needs.
• Lanyard eye at the top of the product allows for securing or for hanging out to dry.
• Manual priming pump is easy to use and works quickly.
• Internal film covers prevent back flow of debris etc. 
• Siphon tube length can be adjust for taller tanks.