Non-Return Valves allow airflow only in one direction.
Non-return valves, also known as Check Valve, or One-Way Valves, are specially designed to allow airflow in one direction and prevent airflow from coming from the opposite direction.
The non-return valves come in two different models – In-line Non-Return Valve and M16 Thread Non-Return Valve.
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Non - Return Valve Product Brochure: Download