Ikelite DL Macro Flat PortIkelite DL Macro Flat Port IK75301 Ikelite Product Number 75301 Product Details Port with flat optical glass element. 67mm threaded outer front for the attachment of external macro wet lenses. Accepts Ikelite 3. 0 diameter filters and accessories. This port can be attached directly to housings featuring the Dry Lock (DL) port system or combined with DL extensions. View the DL System Port Chart What's Included Flat port Vinyl cover cover Securing