Any acceptable single tubing segment material, any acceptable single tubing segment outside surfaces surface treatment.
Cross Sectional Shape
Internal, rectangular external, rectangular
End Application
An/blq-10. Umm/photonics. Type 18 periscope. Submarine surveillance systems. Orion p-3 aircraft. General purpose electronic test equipment (gpete). Ohio class ssn (trident). Ticonderoga class cg (47), emory s. Land class as, sturgeon class ssn (637).