Selecting The Armstrong Air/Gas Vent .. Armstrong see-thru air vent with manual venting. . 1-AV – A cast iron air vent that uses a positive-closing free. INSTALLATION AND OPERATING INSTRUCTIONS Armstrong AVA and AVV automatic air vents continuously remove 1a Model AVA Automatic Air Vent. This bulletin should be used by experienced personnel as a guide to the installation of Armstrong Air/Gas Vents. Selection or installation of equipment shouldThis bulletin should be used by experienced personnel as a guide to the installation of Armstrong No. l-AV Air Vents and their repair parts. Selection or Ref: Baumeister & Marks: Standard Handbook for Mechanical Engineers, 7th .. Armstrong free floating lever Air/Gas 1AV - A cast iron air vent which uses a. Armstrong AV Series Cast Iron Air & Inert Gas Vents. Complete Vents 1-AV. *?”. 1/8. 146. 4.0. AN1625. AO4715. AO4717 AO4717H. 7/64 173. AN1625A. Items 1 - 20 of 29 Armstrong float-type air vents include hydronic heating systems, water service lines, water 1AV-3/4 (1/8) Armstrong AIR VENT 3/4"P 1/8". We have great pricing on the 1AV-3/4 (1/8) Armstrong AIR VENT 3/4"P 1/8". This item usually ships the same day. Armstrong 1/2" 1AV cast iron air vent with a 300 psi maximum operating pressure that uses a free-floating lever that closes positively, ensuring a leaktight closing Vents. Screwed. 300. 200. ASTM A48. Class 30. Cast Iron. 1-AV†. 300.. 0.. 0. 446 .. Armstrong 1-AVCW See-Thru Air Vent with manual venting. Measure