part1 and part 2 ballvalves

here is a part 1 and a part 2 ballvalve, Attachment Deleted

the part 2 valve has come out of this tank here,Attachment Deleted


the part 2 valve has to be used in a cold water storage because its impossible to get back syphonage with a part 2 valve, If you used a part one valve and a certain amount of circumstances came together, you could end up drinking the contents of the tank, or even the toilet cistern, smiley-confused002asak2