Westlock Controls BY-90 Black and Yellow Beacon (90 Degree (1/4 Turn (English language version). Complete with Screws/Fittings, O-Rings and an IOM making fitting as hassle free as possible. The BY-90 is also made from high impact strength, corrosion and UV resistant clear co-polyester. So provides 360 degree colour coding for high visual impact.
BY = Black (Open) / Yellow (Closed)