Ball valves or hole drilled to break siphon

[dearis]

Hi there,

I was wondering whether to use a ball valve or to drill a hole in my return pipes to break the siphon to stop overflows in a power outage.

Regards Darren

[mistakes r crucial]

Holes work and don't cost you a cent.
MAC

[DIY]

Holes work and don't cost you a cent.
MAC

+1

[dearis]

Excelent point

a hole it is!

[Tommo]

Hi Darren
drill a 3mm hole in your return line, just 1 mm below your water level, fill your sump up first 100mm below the very top of the sump and work from that.

cheers Andrew