Red Filter with a 67mm thread which fits over the housing's port and can be installed and removed during the course of the dive. The Red Filter is used to restore the red color absorbed byblue water. In shallow depths, these filters can serve as an attractive alternative to artificial light sources. Can be mounted on 67mm threaded lens ports or other lens ports by using an adaptor. for further information regarding Red Filters.   Important Notice- Prior to purchase, please confirm that no additional adaptor is required to fit this product to your housing. Please to visit the Fantasea Accessory Finder Page. Weight: .04 kg