Polish translation: pięć miedzianych trójników o średnicy zewnętrznej ~ cali
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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:
five ~-in. O.D. copper T's
pięć miedzianych trójników o średnicy zewnętrznej ~ cali
"Five" refers IMHO to the number of T's. So one would expect a number instead of the tilde - something like "Five 4-in. O.D. copper Ts..." = 5 T's each 4 in. OD. Also, Copper and any other kind of piping is normally specified by Nominal Diameter (DN) - not outer diameter - it's meaningless from an engineering point of view