Product Overview

The Pentair Medium Head Impeller is a genuine OEM replacement component engineered for select 5 HP Pentair C Series commercial bronze pumps. Designed for medium-head hydraulic configurations, this impeller transfers motor power into the water movement needed for proper commercial pool circulation. It is specifically identified for CM-50, CMK-50, and CMKL-50 pump configurations and provides the correct factory replacement when the existing impeller is worn, damaged, or requires replacement during a pump rebuild.

Ideal For

Pentair C Series 5 HP commercial bronze pumps

CM-50, CMK-50, and CMKL-50 medium-head pump configurations

Commercial pools, aquatic facilities, hotels, and institutional applications

Professional rebuilds using genuine Pentair replacement components

Key Features

Genuine Pentair OEM commercial pump component

Designed specifically for 5 HP medium-head C Series pump configurations

Compatible with both applicable single-phase and three-phase pump models

Bronze construction suited for Pentair commercial bronze pump assemblies

Closed-face impeller design matched to the original C Series hydraulic configuration

Benefits

Using the correct OEM impeller helps maintain the hydraulic characteristics for which the original C Series pump was designed.

Replacing a damaged or worn impeller can restore proper pump operation when the remainder of the pump, motor, volute, and related components remain serviceable.

The medium-head configuration is specifically matched to CM-series pumps and should not be substituted with a high-head CH-series impeller simply because the horsepower rating is the same.

Specifications

What's Included

• One Pentair 5 HP medium-head replacement impeller

Mechanical seals, gaskets, washers, hardware, shaft components, motors, volutes, and other pump components are not included unless separately specified.

Warranty & Compatibility

Compatibility

Pentair identifies this impeller for the following C Series 5 HP commercial pump configurations:

• CM-50 – 5 HP medium-head configuration
• CMK-50 – 5 HP medium-head configuration
• CMKL-50 – 5 HP medium-head configuration
• Applicable single-phase and three-phase configurations

This component is not interchangeable with the 5 HP high-head impeller used in CH-50, CHK-50, and CHKL-50 pumps.

Always verify the complete pump model and existing impeller part number before ordering.

Installation & Replacement Context

Impeller replacement requires disassembly of the commercial pump wet end. Related components including the shaft seal, impeller washer, washer gasket, impeller lock screw, shaft key, and internal sealing surfaces should be inspected during service.

Commercial pump repair should be performed by a qualified pool-equipment professional. The electrical supply must be disconnected and the circulation system fully depressurized before pump service.

Confirm Before Ordering

Confirm that the existing pump is a Pentair C Series CM-50, CMK-50, or CMKL-50 medium-head 5 HP configuration. Do not order based solely on motor horsepower, as Pentair uses different impellers for medium-head and high-head versions.

Customer-Facing Q&A

Q: Which Pentair pumps use this impeller?
A: Pentair identifies it for 5 HP C Series CM-50, CMK-50, and CMKL-50 medium-head commercial pumps.

Q: Is this the same impeller used in the CH-50 high-head pump?
A: No. The CH-50, CHK-50, and CHKL-50 5 HP high-head pumps use a different impeller. Verify whether your pump is a CM medium-head or CH high-head configuration.

Q: Can it be used with single-phase and three-phase pumps?
A: Yes. Pentair lists this impeller for applicable 5 HP single-phase and three-phase CM-50 family configurations.

Q: Does it include the mechanical seal and gaskets?
A: No. This listing is for the impeller only. Seals, gaskets, washers, and related pump-rebuild components are sold separately.