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RadonAway Hi-PerDrain ST (28477) Sump Cover Drain

Model #: 28477

Condition: New


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RadonAway Hi-Perdrain ST allows water to drain through without air leaks.

The radon industry's most compact, high-performing sump cover drain!

The HI-PERDRAIN™ ST by RadonAway is the best sump drain sealing product in the radon market. Its super-low profile, easy installation (just thread it into one of the 4 sump covers listed below), and you're done!

For existing sump covers: we recommend the HI-PERDRAIN Retrofit Kit 28512. will fit into any existing lid. Using a hole saw just cut a 3.5" hole, drop in the adapter and seal in place.

  • Easy to install
  • Low Profile Design (4" depth)
  • Flows 2.5GPM @ 4" of Vacuum
  • Fits RadonAway Clear Sump Covers (coming soon)
  • Greater than 3 GPM Maximum Flow
  • 2" NPT
  • Durable PVC Body
  • No "Whistling" under Vacuum
  • Removable Grate and Ball for Easy Cleaning/Maintenance


  1. Peel protective paper off both sides of the sump cover’s clear acrylic disk. Note the tapped-from side of the sump cover; this side should be on the bottom of the cover when installed.
  2. Thread the HI-PERDRAIN ST into the sump cover from below / bottom side. Secure with the lock nut supplied with the HI-PERDRAIN ST.
  3. Install the sump cover. Be sure the drain does not get in the way of a pump or anything in the sump. For best results, seal the assembly to the floor or slab air tight (RadonAway PGS or similar sealant).
  4. Snap the access port plug into the 5” hole in the sump cover.
  5. Should any debris foul the float ball in the HI-PERDRAIN ST, pry the inlet grate off with a flat-head screwdriver, remove the ball with a spoon, and clean the drain. Re-install the ball and the inlet grate.

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