which ball valve - high pressure or low pressure?

[wayne]

Hello,

Should I purchase a ball valve marked 'high pressure' or one that is marked 'low pressure'? It's for the water tank in the loft fed by the rising main.

Hope I make sense :)

Wayne.

[Edwin Pawlowski]

Depends on your interpretation of high and low pressures. Do they give any number, such as 250 WOG? You can always use a high pressure in a low pressure situation, but not the other way around so why not be safe?

[Nick Hull]

My SWAG is that low pressure is for gas lines.