I have to replace one or two quick connects on my 12V chem hose 1/2" id. The only markings on them is the brand name Legacy. How does one tell whether it's 1/4", 3/8" or 1/2"? I know it's not 1/2" but I thought I throw that size in there as well. I understand everyone uses Hanson as will I, but those puppies are...