Airflow regulating valves

Five or ten pieces airflow control regulator valve.
Connect 4mm hoses on both sides and turn the valve to adjust the airflow.
Suitable for fish, aquariums.

Specifications:
Material plastic

Size:
Length 3.8cm and 1.5″

Notes:
The real product colors may be slightly different from what you see in the images.
The product dimensions may be slightly different from what is written in the product specifications.