The manual for the N20704S N20703S N20703W and N20704W Day and Night Plus Solar Vent says for a hatch installation a spacer ring (N10863SP or N10864SP) is required. I can not find the spacer ring being sold anywhere.

With the new vents the spacer ring was not required. The spacer ring was made to  fill in the gap  between the  hatch and the trim ring. It was not used to keep water out or any other reason than to fill the gap.  What most people found out was that if you flip the trim ring  upside down and slide it up with the flat part towards the hatch  the spacer ring was not needed.  Due to lack of sales and solution of flipping the trim ring. The spacer ring has been discontinued.

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