F04000-180 Stack Packing is to be used as a split ring seal or as a direct replacement
for V-type packing. It is designed for use in rough plungers, in oversized packing boxes,
in undersized pistons, and in “barber pole” or in “hour glass” pistons. In sizes smaller
than 6-1/2”, a maximum of 3 rings should be used with the remaining space taken up by
spacers to compress the sealing rings. All sealing rings and spacers are split for easier
installation.