AC low pressure valve replacement

Hi All, during the short summer we had, not the dry period predicted by the BBC, I tried the AC in the disco only to discover it didnt work! A visit to Kwik Fit and it worked for 2 days, took it back and theyannounced "you've got a leak" can you fix it I ask "no, but we know a garage that can"
Garage traced the leak to the low pressure valve, after 15 mins guy cant replace the schrider valve so contact Land Rover who inbform him you need to replace the whole pipe at £138 +VAT plus 2 hour labour to fit.

Is there a fix or alternative supplier for a low pressure valve pipe?

Phil

All sorted, there is a shrieger valve but its not shown in the Land Rover parts diagram.