Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

MCDONNELL & MILLER High Capacity Feeder: 51-S Mfr Part # - Replacement HVACR Pumps, Valves & Tubing
MCDONNELLReplacement HVACR Pumps, Valves & Tubing

MCDONNELL & MILLER High Capacity Feeder: 51-S Mfr Part #

MCDONNELL Replacement HVACR Pumps, Valves & Tubing. Specifications: Product Type: High Capacity Feeder.

SKU 3G-OTH-84502

Also listed as: 51S · 51 S

Brand
MCDONNELL
Item
& MILLER High Capacity Feeder: 51-S Mfr Part #
Category
Replacement HVACR Pumps, Valves & Tubing
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

MCDONNELL
Manufacturer Part Number
51-S
Product Type
High Capacity Feeder

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

MCDONNELL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

MCDONNELL Replacement HVACR Pumps, Valves & Tubing. Specifications: Product Type: High Capacity Feeder.

Frequently Asked Questions

What is the MCDONNELL & MILLER 51-S High Capacity Feeder used for?

The MCDONNELL & MILLER 51-S is a high capacity feeder designed to automatically maintain water levels in commercial and industrial boiler systems. It is commonly used in HVAC and steam applications to ensure consistent water supply and prevent low-water conditions.

What are the specifications of the MCDONNELL & MILLER 51-S?

The MCDONNELL & MILLER 51-S is a high capacity feeder with manufacturer part number 51-S. It is classified as a replacement HVACR pump, valve, and tubing component. For detailed technical data, consult the product datasheet or contact 3G Electric.

Where to buy the MCDONNELL & MILLER 51-S worldwide?

You can source the MCDONNELL & MILLER 51-S through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.

How to install the MCDONNELL & MILLER 51-S feeder?

Install the MCDONNELL & MILLER 51-S by mounting it vertically on the boiler return line, ensuring proper pipe connections and electrical wiring per local codes. Follow the manufacturer's manual for pressure settings and testing. Always isolate the system before installation.

Used in

Common applications for MCDONNELL
Steam boiler low-water cutoff — McDonnell & Miller 61 level control
Condensate receiver level monitoring — McDonnell & Miller RS-4-BR-1 4-level sensor
HVACR pump suction filtration — McDonnell & Miller 340700 strainer basket assembly
Flow switch head replacement — McDonnell & Miller 63-HD head mechanism
Boiler control circuit safety — McDonnell & Miller 7-BM electrical switch with manual reset
Field servicing of flow switches — McDonnell & Miller 310452 cartridge kit

MCDONNELL Products

3G Electric supplies MCDONNELL replacement hvacr pumps, valves & tubing. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Pump Accessories Valves & Regulation Motors & Drives All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
MCDONNELL & MILLER Water Feeder: 51-S-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-S-HD Mfr Part #
MCDONNELL & MILLER Water Feeder: 51-S-2-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-S-2-HD Mfr Part #
MCDONNELL & MILLER Water Feeder: 51-B-2M Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-B-2M Mfr Part #
MCDONNELL & MILLER Water Feeder: 551-S-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 551-S-HD Mfr Part #
MCDONNELL & MILLER Level Control Feeder: 51 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Level Control Feeder: 51 Mfr Part #
MCDONNELL & MILLER Level Control Feeder: 51-2 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Level Control Feeder: 51-2 Mfr Part #

More from MCDONNELL

View all MCDONNELL parts
MCDONNELL & MILLER Valve Assembly: 342500 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Valve Assembly: 342500 Mfr Part #
MCDONNELL & MILLER Casting: 150-1 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Casting: 150-1 Mfr Part #
MCDONNELL & MILLER Float Bellows Assembly: 344200 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Float Bellows Assembly: 344200 Mfr Part #
MCDONNELL & MILLER Make-Up Feeder: 21 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Make-Up Feeder: 21 Mfr Part #
MCDONNELL & MILLER Bellows Base Assembly: 343500 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Bellows Base Assembly: 343500 Mfr Part #
MCDONNELL & MILLER Large Bellows: 341900 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Large Bellows: 341900 Mfr Part #
MCDONNELL & MILLER Head Mechanism: 94-HDLS Mfr Part #
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 94-HDLS Mfr Part #
MCDONNELL & MILLER Low Water Cut-Off, 120V, Residential: RB-122E Mfr Part #
MCDONNELL
MCDONNELL & MILLER Low Water Cut-Off, 120V, Residential: RB-122E Mfr Part #