Series 20 · ERECTA SWITCH®
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.
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.
| Quantity | Price |
|---|---|
| 1–2 | $38.20 |
| 3–4 | $34.36 |
| 5–9 | $30.57 |
| 10+ | $27.69 |
The 20-725-HS is the housing body of the Series 20 control head system — the enclosure without the factory-installed relay. Used for custom relay assemblies, replacement housing, or when relay and wiring components are supplied separately. Rain-tight O-ring sealed ABS construction. Relay compartment interior measures 30.8 × 21 mm.
| Specification | Value |
|---|---|
| Connection | 1-1/4 NPT |
| Conduit | 1/2 in |
| Set Screws | 4× |
| Seal | O-ring at cap and base, rain-tight |
| Diameter | 3.0 in (76.2 mm) |
| Length | 5.85 in (148.59 mm) |
| Relay Interior | 30.8 × 21 mm |
| Material | Injection-molded ABS, fire retardant |
| Ambient Temp | 130°C max |
| Pressure | Atmospheric |
A float level switch like the 20-725-HS 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.
The 20-725-HS 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.
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.
The 20-725-HS 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.
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.
Point detection is repeatable and mechanical. The trip height on the 20-725-HS 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.
Our engineering team can verify compatibility with your application and chemistry before you order.