Sea and Sea Extension Rings

An extension ring changes the spacing in a compatible housing-and-port system. The Extension Ring 40L listing identifies its particular extension length, but the manufacturer's chart determines the correct combination. Match the exact lens and port before selecting a ring. Confirm the locking and connection system as well as the required spacing.

A conversion fitting changes the connection between particular housing and port systems. The ML-NX Conversion Ring 30 listing describes a compatible ML-to-NX arrangement. Check the exact housing, lens and port against the manufacturer's chart rather than selecting by the ring name alone. Include any additional extension rings specified for that combination.

The RDX Port Base L listing describes an adapter for compatible RDX housings and NX-series ports. Confirm that both sides of your planned connection match that arrangement. The final lens and port combination still needs to come from the manufacturer's system chart. Treat the base as one component of the setup, not a complete ready-to-use port system.

Use the manufacturer's port chart for the exact housing and lens combination. Extension length and port fitting must match the complete setup; a ring should not be selected by diameter alone. Check required seals and any additional components specified for that configuration.

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