Remove the "U" from a dwelling & you get a tubular water carrier
If you have not received a faxed permit within twenty four hours of 
the time .... _____ TUBULAR SKYLIGHTS: any U / SHGC up to 3 ft. [DOC] [TLE] Glossary of Terms - Corning [PAR] Make sure you are familiar with all the terms you need to know to be fluent in fiber 
... which is surrounded by a tubular outer conductor covered by more insulant.