I went to da another d/valve expecting to be there 2 - 3 hours , so at 3.30 i got there and by 3.50 i had the old one out. Then i set the nmew parts out and started and by 4.10 it was in and then i tested it all perfect.Ive got another on sat , i hope it goes as well. A good day today i done the rad with the iron pipes, didnt drain down just went for it all good, thanks for your advice boys