DD-G-511E, FEDERAL SPECIFICATION: GLASS TUBING, ROUND (15 SEP 1983)

DD-G-511E, FEDERAL SPECIFICATION: GLASS TUBING, ROUND (15 SEP 1983)., This specification covers heat-resistant, high-pressure glass tubing for use in liquid level gages on low pressure boilers (250 lbs per square inch maximum) and hot water tanks.