HYDRASUN i found a supplier for couplings and hoses and any pipe connection in glasgow area after looking on there web site they have a few places ,i got some camloc couplings from them 1/2" stainless for a bit cheaper than introco i dont know about postage as im local but the guy was very helpfull gave me a few different options i had not even looked at hope this is of help to someone !!!!!