Cyl-Tec”saluminum industrial/specialty gas cylinders have a natural shoulder andbrushed finish and come standard with parallel threads. Testing andmaintenance services for all types of high-pressure cylinders include:U.S. DOT hydrostatic and ultrasonic testing; external shot blasting andspray painting; internal shot blasting and oxygen cleaning; specialpaint requirements; gas service changes; siphon tube replacement andinstallation; neck ring replacement and installation; valvereplacement; cylinder stenciling and stamping; cylinder cradle repair;cylinder cradle manifold repair.