How did street originate in the plumbing term street ell?
Ans) A "street ell" may have gotten its name due to it describes a 90° fitting particularly useful in tight, street ditches. When installing water pipes under a street, or from a water service, again under the street, into a home/ business, this street ell permits one to change pipe direction with one less fitting, and in less space, than with a standard ell.