ERECTA SWITCH® by Compac Engineering
Series 20 · ERECTA SWITCH®

Pump Controls & Components

Series 20 pump control assemblies and replacement components. Complete pump control sets, control heads, stems, floats, and hardware for extended-stem level sensing systems.

Pump Control Complete Sets

20-202 Pump Control Set

20-202 — Pump Control Set

Complete pump control set: 20-725 control head + 20-726 stem set with float. Available in 120V and 240V configurations.

Starting at $377.04
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20-725 Control Head

20-725 — Control Head

Series 20 control head with factory-sealed 20A SPDT relay. Rain-tight O-ring sealed ABS enclosure. 1-1/4 NPT. Accepts 20-726 stem set.

Starting at $95.47
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Pump Control Components

20-719-NO Switch Assembly

20-719-NO — Switch Assembly

Series 20 replacement switch assembly. Normally open Bestact™ switching element for Series 20 pump control systems.

Starting at $30.93
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20-720 Magnetic Float

20-720 — Magnetic Float

Hollow magnetic float for Series 20 ERECTA SWITCH assemblies. 2.06" diameter, 20 PSI max. Replacement and OEM float.

Starting at $12.38
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20-721 Collar Stop

20-721 — Collar Stop

Series 20 collar stop for float travel limiting on extended-stem assemblies.

Starting at $4.57
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20-722 Stem

20-722 — Stem

Series 20 stem tube for extended-stem assemblies. Available in 20", 40", 60", and 100" lengths.

Starting at $10.20
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20-723 Lead-In Bushing

20-723 — Lead-In Bushing

Series 20 lead-in bushing for stem-to-housing interface on extended-stem assemblies.

Starting at $1.73
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20-724 Retaining Ring

20-724 — Retaining Ring

Series 20 retaining ring for securing components on extended-stem assemblies.

Starting at $1.73
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20-725-HS Relay Housing

20-725-HS — Relay Housing

Series 20 relay housing body, 1-1/4 NPT. Rain-tight ABS enclosure for custom relay assemblies or housing replacement. Accepts 20-726 stem set.

Starting at $27.69
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20-726 Stem + 1 Float Set

20-726 — Stem + 1 Float Set

Series 20 stem set with one float. Available in 20", 40", and 60" lengths. Mates with 20-725 control head.

Starting at $32.47
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20-727 Stem + 2 Float Set

20-727 — Stem + 2 Float Set

Series 20 stem set with two floats for dual-point level control. Available in 20", 40", and 60" lengths.

Starting at $56.02
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Frequently Asked Questions

Common Questions About This Product

What is the difference between a float level switch and a liquid level sensor?

A float level switch like the Series 20 level switch is a point-level device: a float rides the liquid and actuates a magnetic reed switch at a set height, giving a simple on/off signal — no power, no firmware, no calibration. "Sensors" usually means continuous measurement (ultrasonic, radar, capacitive). ERECTA SWITCH targets reliable discrete-point control.

What are the typical applications for the Series 20 level switch?

The Series 20 level switch is used for pump start/stop control, high-level overflow protection, low-level dry-run protection, and tank or reservoir level alarms in OEM equipment. The modular ERECTA SWITCH system is built into laundry, HVAC, water-treatment, hydraulic, and chemical-handling machinery.

What liquid chemistries is the Series 20 level switch compatible with?

Choose the material to match the media: Polypropylene (PP) for general aqueous, acids, and bases; Acetal (AC/Delrin) for solvents, fuels, and hydrocarbons; Kynar PVDF (KR) for aggressive or harsh chemicals. Every ERECTA SWITCH model is offered in all three materials.

Is the Series 20 level switch a point-level or continuous-level device?

The Series 20 level switch is point-level — it provides a discrete on/off signal at a set height. For multiple switch points, use a multi-level extended-stem set (2-, 3-, or 4-level) instead of a single continuous sensor.

What mounting options are available for the Series 20 level switch?

ERECTA SWITCH offers vertical top-mount, bulkhead, and extended-stem configurations, plus side-mounted single-point models. The mount style is part of the model number — select the configuration that matches your tank geometry.

How is the actuation level set on the Series 20 level switch, and how accurate is it?

Point detection is repeatable and mechanical. The trip height on the Series 20 level switch is set by the 10-715 Precision Nipple, ordered separately in 1-inch increments (1″–70″), so you place the switch point exactly where the application needs it.

Need Help Choosing?

Our engineering team can recommend the right Series 20 configuration for your application.