Robinair 13172 Maintenance Kit * Robinair Maintenance Kit keeps recovery and recycling units operating at peak efficiency. It"s a convenient maintenance kit that contains one quick change filter-drier to be used on both R-12 and R-134a stations, and one 16 ounce bottle of the Premium High Vacuum Pump Oil. Its compatible with early models using 34430 Filter-Drier (17700A, 34700, 34300-2K). See your instruction manual if you have questions about which filter-drier to use. * Keep recovery and recycling units operating at peak efficiency * One quick change filter-drier to be used on both R-12 and R-134a stations * One 16 ounce bottle of the premium high vacuum pump oil * One 16 ounce bottle of our premium high vacuum pump oil * One year limited warranty