Aprilaire 4655 Manual Humidistat Fits models: 400, 400A, 400M, 500, 500A, 500M, 600, 600A, 600M, 700, 700A, 700M. Does not require 4039 adapter plate. Replaces 4016 Humidistat.
The Magnet logo on this page signifies that this product is a factory direct replacement to the OEM branded filter.