My apologies gas4you for not thanking you for your help on my first query. but thank you both for your help. as you may have geussed this is my first time to use this system and with helpful people like yourselves i will use it more often and maybe one day i may be of assistance to you both once...
Thanks soggy weetabix for the quick reply but the there is only pipe fitting on one end of rad i.e. both in and out of water supply go to one control hope that i have explained this right