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The Ewa-Marine EM RA 30-37mm Adapter Ring is a replacement 30 to 37mm step-up ring for select Ewa-Marine video housings. It enables you to attach lenses with a 37mm thread on a 30mm filter. The adapter ring attaches the front of the lens to the housing's glass port. It is compatible with the VDT, VPD, VPE and VIP video housings.