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Armstrong International D500975 is a cast iron air vent designed for a 3/4 NPT connection. It operates effectively for service up to 173 psi. The 1-AV model features a free-floating lever that closes fully, providing a leak-tight seal in all conditions.
This air vent is pivotal for ensuring proper steam flow in heating systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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