H2O Audio, maker of waterproof iPod cases, has announced a new waterproof RCA cable and case enhancement for its SV-iP4G product line. The new cable allows watersport enthusiasts to connect their iPods to any stereo system with standard RCA inputs, including most marine audio systems, outdoor stereos, and spas. The RCA cable accessory sells for $19.95. The upgrade kit for H20’s SV-iP4G case provides owners of the slightly thicker 20GB and 30GB color screen iPods with a waterproof housing and headset solution. The free modification kit lets owners of the company’s standard 4G iPod case to easily upgrade it to accommodate the color screen models.