The latest in sprinkler head protection, Polymer Molding's new BP series bulb protectors are designed to protect glass bulbs during shipping and installation. Developed in cooperation with major sprinkler head manufacturers, this new series is made of impact-resistant HDPE material and is manufactured in fluorescent orange to aid in visibility during final systems walk-through and floor-to-ceiling inspections. The snap together fastener is simple to install and easy to remove. Currently available in four standard sizes with several new custom sizes under development. Polymer Molding. Circle 15.