The JL Audio ETXv3 Enclosed Speaker System Fixture â 2.875" (M-MCPv3-2.875) is designed to securely mount JL Audio ETXv2 and ETXv3 enclosed speakers to 2.875-inch diameter pipes. Built for durability in marine and powersports applications, it ensures a reliable and professional-grade installation.• Compatible with JL Audio ETXv2 and ETXv3 enclosed speaker models• Designed for 2.875" diameter pipe mounting• Rugged, weather-resistant construction | JL Audio ETXv3 Enclosed Speaker System Fixture f/ Pipe Mounting 2.875