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21-AR and 21-312AR/VAR Fixed Pivot Ball Float Air/Gas Vents
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 tight shutoff.
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
No. 21AR and No. 21-312 AR Air Vent – Installation and Maintenance (PDF)
Model 21-AR Fixed Pivot Air/Gas Vents – Installation and Maintenance (PDF)
Series 21-312 AR and VAR Fixed Pivot Air/Gas Vents – Installation and Maintenance (PDF)