Question for those with an N clear M roller

[exnisstech]

I'm assembly mine and wondering about the third rubber piece that has a larger cut out? I'm assuming maybe for a specific brand of sump but inquiring minds like to know.

 

[NatureDimensions Verified Sponsor]

Good question! There are two taller water blockers and one shorter one in the kit.

- Use a taller blocker at the back, on the sensor side.
- At the front, choose either the taller or shorter blocker to suit your sump's filter-sock opening and water level.

You can try both front options and use the one that gives you the smoothest flow and least noise while keeping the sock opening properly sealed. The third piece is simply the alternative front blocker.