EnviroComfort Air Conditioning Kits Ideal for Easy Retrofits or New Installations EnviroComfort (ECD) R-410A Retrofit Kits make replacing your old air conditioning system easy. For new installations, add the Installation Kit, which contains all plumbing and air distribution components for a complete A/C system. The ECD Retrofit Kit is designed to replace an old boat air conditioning system The Installation Kit includes plumbing and air distribution parts for a new A/C system The optional Dual Duct Kit has components for treating a second interior space ECO Holding Tank Vent Filter Advanced Odor Removal – Easy to Install & Replace With the first major change to the original SeaLand vent filter in over 25 years, Dometic delivers everything boaters want in vent filter performance and reliability. The ECO vent filter uses 55% less plastic than previous models and is constructed with earth-friendly, recyclable plastic components. The ECO vent filter is designed as a direct replacement for previous SeaLand and Dometic vent filters. The innovative concave shape of the ECO vent filter assures that malodorous gases are completely filtered through activated odor-absorbing charcoal media. The result is more thorough odor elimination – and the assurance of more enjoyable boating.