The Bayliss XL Piston or Power Tube is a direct replacement component designed specifically for the Bayliss XL Automatic Greenhouse Vent Opener. If your current unit is no longer responding as it should, replacing the power tube is a simple and cost-effective way to restore smooth, temperature-driven vent operation.

This tube contains a heat-sensitive wax core that expands as temperatures rise and contracts as they fall, driving the piston that opens and closes your greenhouse vent automatically. It helps maintain a stable growing environment without electricity or manual adjustment.

KEY FEATURES

• Designed for Bayliss XL only: Compatible exclusively with the Bayliss XL Autovent.
• Restores vent performance: Brings your automatic opener back to proper working condition.
• Heat-activated operation: Uses wax expansion for reliable, power-free control.
• Cost-effective solution: Extend the life of your existing vent opener.

SPECIFICATIONS

INSTALLATION GUIDE

For accurate setup and proper function, the power tube must be cooled before installation. Place the tube in a refrigerator for approximately 30 minutes to allow the wax inside to contract.

After cooling, press the piston rod firmly against a hard surface until it retracts into the tube. Install the unit with the vent arms in the closed position to ensure proper alignment with the vent and mounting points.

Skipping the cooling step may prevent the unit from being set correctly.

MAINTENANCE AND CARE

Ensure the piston remains clean and free of debris for smooth operation. Periodically check alignment and mounting points to maintain consistent vent performance over time.

FREQUENTLY ASKED QUESTIONS

What does the power tube do?
The power tube contains a wax-filled cylinder that expands with heat, pushing the piston to open your greenhouse vent automatically.

Why do I need to refrigerate the tube before installation?
Cooling the tube contracts the wax inside, allowing the piston to reset properly so the vent opener can be installed and calibrated accurately.

Will this fit other auto vent brands?
No. This replacement tube is designed specifically for the Bayliss XL Autovent and will not fit standard or non-XL models.

When should I replace the power tube?
If your vent no longer opens fully or responds slowly to temperature changes, replacing the power tube can restore proper operation.