This M67 DUAL FLIP DIOPTER HOLDER from SCUBALAMP turns any port with a 67mm thread into a flip adapter for 2 M67mm lenses.

• Secure design, machined aluminum adapter
• Screws into 67mm threads, works with 67mm threads (including all macro ports, and several flat ports for the mirrorless cameras).
• Clip lock keeps the lenses from flipping out while you are shooting.
• Spring tension keeps the lens from flipping back in front of your port when you are not using it.