McDonnell & Miller 21 Water Feeder

Make-Up Water Feeder for Boiler Receiver Tanks with 35 PSI Max Vessel Pressure, 3/4" NPT Connection, and 5 3/4" Bolt Circle (Part Number 126400)

McDonnell & Miller 21 Make-Up Water Feeder – 3/4" NPT, 35 PSI Max, Part #126400

The McDonnell & Miller Series 21 Water Feeder (Part Number 126400) is a high-performance make-up water feeder designed specifically for boiler receiver tanks. Manufactured by Xylem-McDonnell & Miller, this unit provides reliable proportional feed action to maintain proper water levels while preventing system damage caused by pressure imbalance or low-water conditions.

Featuring a 3/4" NPT connection and 5 3/4" bolt circle, the Series 21 feeder offers a direct-mount design, eliminating the need for equalizing connections and simplifying installation. Its soft-seat valve construction ensures a secure seal and smooth operation.

Key Features

• Genuine McDonnell & Miller Series 21 Water Feeder

• Direct-mount design — no equalizing connections required

• Proportional feed action for accurate water level control

• Soft seat provides secure sealing and reliable performance

• Compatible with boiler receiver tanks

• 3/4" NPT connection with 5 3/4" bolt circle

• Maximum supply pressure: 150 PSI

• Maximum vessel pressure: 35 PSI

Specifications

• Brand: McDonnell & Miller (Xylem)

• Model/Series: 21

• Part Number: 126400

• Application: Make-up water feeder for boiler receiver tanks

• Max Supply Pressure: 150 PSI

• Max Vessel Pressure: 35 PSI

Applications

Ideal for commercial and industrial boiler systems requiring automated and reliable water level control for receiver tanks.

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