![McDonnell & Miller 157S-MD Low Water Cutoff Switch, Max Differential — New England Supply House spec card [NESH-SPEC-CARD-V2]](http://newenglandsupplyhouse.com/cdn/shop/files/nesh-157smd-card.png?v=1794028404&width=1946)
![McDonnell & Miller 157S-MD Low Water Cutoff Switch, Max Differential specifications — New England Supply House [NESH-SPECTABLE-V1]](http://newenglandsupplyhouse.com/cdn/shop/files/nesh-157smd-specs.png?v=1794028405&width=1946)
McDonnell & Miller 157S-MD Low Water Cutoff Switch, Max Differential
McDonnell & Miller 157S-MD Low Water Cutoff Switch, Max Differential
Regular price
$2,249.39 USD
Regular price
Sale price
$2,249.39 USD
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Low stock: 5 left
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SKU:157S-MD
View full details![McDonnell & Miller 157S-MD Low Water Cutoff Switch, Max Differential — New England Supply House spec card [NESH-SPEC-CARD-V2]](http://newenglandsupplyhouse.com/cdn/shop/files/nesh-157smd-card.png?v=1794028404&width=1445)
![McDonnell & Miller 157S-MD Low Water Cutoff Switch, Max Differential specifications — New England Supply House [NESH-SPECTABLE-V1]](http://newenglandsupplyhouse.com/cdn/shop/files/nesh-157smd-specs.png?v=1794028405&width=1445)
The McDonnell & Miller 157S-MD is a low water cutoff switch with a maximum differential snap switch setting. It shuts down the boiler if the water level drops below a safe point, protecting the equipment from dry-firing.
Confirm this part number against your equipment's parts list before ordering.
Specifications
| Part Number | 157S-MD |
|---|---|
| Brand | McDonnell & Miller |
| Type | Low Water Cutoff Switch |
| Differential Setting | Maximum |