Franklin C Series Convertible Jet Pump – Cast Iron Shallow/Deep Well Pump – 1/2 HP & 3/4 HP

Franklin C Series Cast Iron Convertible Jet Pumps – ½ HP & ¾ HP

The Franklin C Series Convertible Jet Pumps deliver dependable, high-efficiency water transfer for residential, agricultural, and light commercial systems. Engineered for both shallow well and deep well applications, the C Series offers impressive performance—delivering up to 16 gallons per minute—and is built for long service life under demanding conditions.

Constructed with a heavy-duty cast iron volute and motor bracket, the pump provides durability and vibration resistance, while the stainless steel impeller ensures consistent hydraulic performance and superior wear resistance. The precision-molded thermoplastic diffuser, carbon/ceramic mechanical seal, and stainless steel shaft further enhance reliability.

Versatility is central to the C Series design. Its screw-in injector and bypass plug allow quick conversion from shallow well to deep well configurations. Multiple discharge options and dedicated NPT gauge/AVC ports make installation straightforward and adaptable.

With NSF/ANSI/CAN 372 certification, a factory-installed 30/50 PSI pressure switch, and operating limits up to 140°F (60°C) and 75 PSI, the Franklin C Series offers an efficient, potable-water–safe pumping solution for a wide range of systems.

Key Features

Durable Cast Iron Construction

• Heavy-duty volute and motor bracket for stability and long equipment life.

Convertible Design

• Screw-in injector for shallow wells; simple conversion to deep well using the included bypass plug

• Deep well jet kits sold separately.

High-Performance Hydraulics

• Stainless steel impeller for consistent, durable performance

• Thermoplastic diffuser precision-molded to maximize efficiency

• Delivers up to 16 GPM

Versatile Plumbing Connections

• 1½" inlet, two ¾" outlets, and one 1" outlet

• ¼" NPT ports for gauges and automatic control valves

Factory-Set Pressure Switch

• Adjustable 30/50 PSI switch included on all models

Safe for Potable Water

• Certified to NSF/ANSI/CAN 372 (low lead)

Operating Limits

• Max temperature: 140°F (60°C)

• Max working pressure: 75 PSI

Available Variants

• ½ HP – Ideal for low-to-moderate household demand or shallow wells

• ¾ HP – Suitable for deeper wells or higher flow requirements

Frequently Asked Questions (FAQs)

What is the difference between shallow well and deep well setup?

• Shallow well (0–25 ft) uses the factory-installed screw-in injector.

• Deep well (up to ~80–100 ft depending on jet kit) requires replacing the injector with a bypass plug and installing a deep well jet assembly (sold separately).

How do I choose between the ½ HP and ¾ HP models?

• ½ HP is suitable for smaller homes, short piping runs, and lower flow demand.

• ¾ HP is recommended for deeper wells, higher flow needs, multiple fixtures, or irrigation systems.

Can this pump be used for potable (drinking) water?

Yes. The pump is NSF/ANSI/CAN 372 certified, meaning it meets low-lead requirements for drinking water systems.

Does the pump include a pressure switch?

Yes. Both variants come with a factory-installed 30/50 PSI adjustable pressure switch.

Are deep well injector kits included?

No. Deep well jet kits must be purchased separately, and the required kit depends on well depth and pipe size.

What plumbing connection sizes are available?

• Suction inlet: 1½"

• Discharge ports: two ¾" options and one 1" option

• Accessory ports: ¼" NPT for gauges and AVC devices

What is the maximum working pressure?

The pump is rated for 75 PSI maximum working pressure.

What is the maximum fluid temperature?

Up to 140°F (60°C).

Are the motors outdoor-rated?

Yes. The C Series uses 56J-frame motors suitable for indoor or outdoor installation (with weather protection).

Does the pump require priming?

Yes. As with all jet pumps, the pump must be fully primed before operation to avoid damage.

Is the impeller corrosion resistant?

Yes. The stainless steel impeller resists corrosion and maintains performance over long-term use.

Can the C Series be used for irrigation or sprinkler systems?

Yes. With flow capabilities up to 16 GPM, the pump performs well for lawn irrigation, gardens, and small agricultural systems.