Widely applied:
Compatible with Aprilaire humidifiers models of 220, 224, 440, 550, 550A, 550-A, 558, 560, 560A, 560-A, 568, 600, 700, 760, 760A, 760-A and 768. Does not work on models 330, 445, 110, 112, 350 and 360
Replace number of A2012-S118, B2035-S2, B2035-S5, B2035-S54, B2035-S55, B2015-S51, B2015-S54, B2015-S58, B2015-S65, B2015-S68, B2015-S85 and B2015-S87.

How to install:
Step 1: disconnect the humidifier, shut off the water supply to the unit.
Step 2: remove the old solenoid: unclip the wires from the solenoid, using the adjustable wrench to unscrew the compression nut and then remove the distributor and tube. Let any remaining water drain into the plastic container. Disconnect the water supply and use a screwdriver to unscrew the screws and discard the old solenoid.
Step 3: install the solenoid: align the new solenoid and then tighten the screws. Connect the water supply line. Replace the distributor tube and tighten the compression nut. Finally connect the wires to the solenoid.
Step 4: reconnect the humidifier

Specifications:
Model No.: A2012-S150
Pressure: 125 PSI
Volt: 24 VAC
Frequency: 50/60 Hz
Material: brass and copper wire

Package includes:
1 x A2012-S150 solenoid valve

The mention of these brands and any related model above is only for purposes of expressing compatibility, not for trademark, and our trademark is Mudder.