500x500 Neo gully drain siphon

An additional or replacement siphon for Vodaland’s 500x500 Neo gully drains. Each gully package comes with one siphon as standard. If you’re connecting to more than one outlet, add a siphon for each extra outlet so every connection stays trapped. The siphon holds a water seal that stops foul air and smells escaping through the grate, and it helps keep debris out of downstream pipework.