Active Air CO2 regulator Inlet washer

Replacement O-Ring Washer for CO2 Regulator Inlet Connection

The Active Air CO2 Regulator Inlet Washer is a replacement O-ring seal for the inlet fitting on Active Air CO2 regulators. The inlet washer sits at the connection point between the regulator and the CO2 tank valve, forming a seal that prevents CO2 from leaking at the fitting.

Over time, inlet washers compress, harden, or crack under repeated use and the pressure of compressed CO2. A worn or missing washer allows CO2 to escape at the connection point rather than flowing through the regulator as intended. Keeping a replacement washer on hand eliminates unnecessary waiting time when a seal wears out.

Key Features & Benefits

• Replacement Seal — Replaces the O-ring washer at the CO2 regulator inlet connection.
• Prevents CO2 Leaks — A properly seated washer seals the regulator-to-tank connection, preventing gas loss.
• Compatible with Active Air Regulators — Designed to fit Active Air CO2 regulator inlet fittings.
• Easy Replacement — Simple swap when the inlet connection shows wear, hardening, or leakage.
• Inexpensive Maintenance Part — Low-cost component that prevents CO2 waste from a leaking connection.

Who Should Use This Part

The inlet washer is a maintenance item for any grower running a CO2 regulator and tank system. When a CO2 regulator develops a hissing leak at the tank connection point, the inlet washer is typically the first component to check and replace. Keeping a spare on hand prevents downtime during CO2 supplementation.

CO2 Regulator Connections and Leak Prevention

CO2 tanks store gas at very high pressure. The regulator inlet connection must seal completely to prevent gas loss and to ensure that flow is controlled entirely by the regulator's internal components. The inlet washer is the primary seal at this connection. A correctly seated, undamaged washer forms a gas-tight joint. If the connection leaks, the washer should be inspected and replaced before troubleshooting internal regulator components.

Frequently Asked Questions

What does the inlet washer do?

The inlet washer seals the connection between the CO2 regulator and the tank valve, preventing CO2 from escaping at the fitting.

How do I know when to replace it?

Replace the inlet washer if you hear a hissing sound at the regulator-to-tank connection, if you smell CO2 at the fitting, or if the washer appears cracked, hardened, or deformed.

Is this compatible with my Active Air regulator?

This washer is designed for Active Air CO2 regulator inlet fittings. Verify compatibility with your specific regulator model.

Is it difficult to replace?

No. The inlet washer is located inside the regulator's inlet fitting and can typically be replaced by removing the regulator from the tank, swapping the washer, and reconnecting.

Why keep a spare on hand?

If an inlet washer fails during CO2 supplementation, having a replacement on hand prevents waiting for a part to ship while CO2 supplementation is interrupted.