For pressures to 600 psig (41 bar) or specific gravity down to 0.83
21-AR—A small, economical air vent of high quality.
It uses a single lever with a fixed pivot and viton seat, ensuring
21-312 AR/VAR—Forged steel
version of the Model 21 with a larger float and higher leverage.
Available with screwed, socketweld or flanged connections.
Installation and Maintenance