Shurflo pump 100 psi Pressure switch

Genuine Shurflo 100psi Pressure Switch (94-375-18) for Window Cleaning

Restore peak performance to your water-fed pole system with a genuine Shurflo 100psi pressure switch. This essential replacement part (model 94-375-18) is designed for Shurflo 8000 series pumps, ensuring your system operates efficiently and protects your pump from damage.

Why upgrade your Shurflo pump's pressure switch?

• Essential for pump protection: The pressure switch is a crucial safety component, designed to cut the pump's power when the trigger is released. This prevents your Shurflo pump from running dry and overheating, extending its service life.
• Optimised for 100psi systems: Specifically calibrated for 100psi operation, this switch provides the precise cut-off pressure needed for single-pole window cleaning setups.
• Genuine Shurflo quality: As a manufacturer-approved spare part, this switch offers a reliable and perfect fit, ensuring seamless operation with your existing Shurflo pump.
• Easy installation: This kit includes instructions to make the replacement process straightforward. A new pressure switch is an easy and cost-effective fix if your pump has power but won't operate.

Key features

• Model number: 94-375-18
• Pressure rating: 80-100psi cut-off
• Compatibility: Designed for Shurflo 8000 series pumps
• Application: Ideal for pure water window cleaning systems

Is this the right part for you? If your pump isn't cutting out correctly or has stopped working, a faulty pressure switch may be the cause. This replacement kit is the perfect solution to get your equipment back in action, delivering the reliability you expect from a Shurflo pump.

Don't let a faulty switch disrupt your workday. Invest in a genuine Shurflo pressure switch today for a quick and reliable fix.

Causes of failure

The pressure switch is a small but sensitive component, and several factors can cause it to fail over time. Here's a breakdown of why pressure switches fail on Shurflo pumps used for window cleaning:

⚙️ 1. Pressure Cycling / Rapid On-Off Switching

• Cause: The system pressure fluctuates rapidly (for example, if you're using a pole with small jets or closing the tap partially).

• Effect: The switch turns on and off too frequently ("cycling"), which burns or pits the switch contacts.

• Fix: Add a Variflo V16 controller.

💧 2. Water Ingress / Moisture Damage

• Cause: Water or condensation enters the pressure switch housing (especially if the pump is used outdoors or gets splashed).

• Effect: Corrosion on contacts or short-circuiting of the switch.

• Fix: Keep the pump and switch dry and covered; mount the pump in a sheltered area if possible.

🔋 3. Running Dry or Air in the System

• Cause: Air leaks or running the pump without enough water flow.

• Effect: The pump can't build steady pressure, so the switch rapidly cycles, wearing it out.

• Fix: Ensure airtight hose fittings, proper priming, and steady water supply.

⚡ 4. Electrical Overload

• Cause: Dirty or loose connections, undersized wiring, or a weak battery can cause the pump to draw higher current.

• Effect: The higher current flow overheats or burns the pressure switch contacts.

• Fix: Use correct gauge wiring, solid connections, and a fuse-rated circuit for the pump.

🧽 5. Debris or Scale Build-Up in the Switch

• Cause: Hard water residue or debris in the pump head can block or interfere with the diaphragm that triggers the switch.

• Effect: The switch stops sensing pressure accurately or gets stuck "on" or "off."

• Fix: Flush the system with clean, filtered water, and inspect/clean the switch and diaphragm regularly.

💡 Pro Tip

If your Shurflo pump is being used for window cleaning (pure water system), It is often better to bypass the pressure switch altogether using a Variflo controller..Flow controllers regulate the current to the pump, giving smoother operation and preventing switch failure altogether.