Extend the life of C29AV-1 installations in environments that punish exposed hardware. The JBL MTC-29MK marine grille kit is designed for retrofit use where salt air, moisture, and chemical exposure can degrade standard ceiling speaker finishes. It pairs an extra-thick painted aluminum grille with WeatherMax backing and stainless steel grille screws to help preserve appearance and performance in demanding spaces. Specify it for seaside restaurants, resort properties, water parks, and swimming facilities where long-term reliability matters as much as sound coverage. The black finish supports discreet integration in darker ceilings and architectural spaces, while the marine-grade construction helps reduce maintenance and replacement cycles. Sold as an individual kit, it gives integrators a practical upgrade path when the acoustic platform is already selected but the environment calls for more protection. For projects where access is difficult and downtime is expensive, this kit adds a layer of resilience without changing the loudspeaker design. It is a focused accessory for teams that need the installation to hold up, look right, and stay serviceable over time.