Armstrong model 1AV cast iron air vent with a 1/2" NPT connection for service up to 146 psi. The 1AV uses a free-floating lever that closes positively, ensuring a leak tight closing under all conditions.
Armstrong is a global company, spanning five generations of family ownership, which manufactures and sells intelligent system solutions for steam, air, and hot water applications across dozens of industry categories such as health care, education, industrial manufacturing, and more. Armstrong offers steam trapping and steam tracing equipment, steam system testing and monitoring products, pressure and temperature controls, water temperature controls, water heating products, hot water process controls, heating and cooling coils, strainers, radiator products, air/gas vents, and more. Armstrong is committed to sustaining the needs of future generations by conserving and saving energy and implements this throughout its product line.