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Thermostat grommets

I'm having a hard time finding a supplier that sells these rubber grommets that you install into a ½" knockout on a Taco or Caleffi zone valve controller. It's rubber and I typically use a knife to make an incision to make way for a stat wire. Does anyone have a resource for these?
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab

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