[andyralph]

Hi all I want to fit an inline tds metre on my 40/40 set but no idea how to do it as my hose and tubbing are bigger than the tds tubeing as I think it's a 1/4 of an inch any advice thanks andy

[Clever Forum Name]

http://gardinerpolesystems.co.uk/all-products/pure-water-systems/water-treatment/tds-meters/sm-1-single-line-tds-monitor-with-john-guest-fitting-by-hm-digital.html

Then just buy the relevant barbed fittings or push fit fittings.

The above comes in 3 different sizes under options.