The INRAD 400 Hz CW Filter offers superior performance when compared to the ICOM FL-52A. Not only is it 100 Hz narrower but the skirts are much steeper than the ICOM FL-52A CW Filter. This INRAD 400Hz CW Filter was removed from an IC-718. It is in excellent condition as cam be seen in the two photographs. It will work in the following radios, IC-703, IC-706, IC-706MkIIG, IC-718, IC-737, IC-751, IC-756, IC-756PROII and in any other ICOM radio that uses the ICOM FL-52A. $165 SHIPPED via USPS Priority Mail. PayPal OK. Call or text (330)-206-4909.