well i cant remember the name for the fitting, maybe junction....no..... crap they use them in automotive and industrial coatings applications. they use for metered mixing and filtering systems etc. they have varying numbers of ports that flow into one outlet. not sure but i suppose as long as its low pressure you could try fit them all in to one threaded fitting and make a solder cap around them where they go in. weeeeeezard this sounds like your realm....of which you seem to abound.