We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Steel conduit hole seal, 0.87 inch diameter, silver finish

HOFFMAN

HOFFMAN AS050 Conduit Hole Seal 0.87 In Steel

SKU CH-PM5C-16Z3V

Steel seal closes 0.87 in conduit or pushbutton holes for 0.5 in conduit size

  • TypeElectrical Replacement Parts
  • Seals 0.87 in openings against dust and moisture
  • Fits 0.5 in conduit knockouts for clean enclosure finish
  • Steel construction resists corrosion in harsh environments
  • Eliminates unused pushbutton holes to maintain NEMA rating
  • Ready-to-install design saves time on panel assembly

Conduit hole seal for 0.87 inch openings

The Hoffman AS050 is a steel plug designed to close unused pushbutton or conduit holes in electrical enclosures. It fits a hole diameter of 0.87 in and corresponds to a 0.5 in conduit size. The component maintains the integrity of the box by preventing dust, moisture or debris from entering through open knockouts. It is a new replacement part supplied by NVENT HOFFMAN.

Suited for panel builders closing standard knockouts

This seal suits electricians and panel builders who need to blank off a 0.87 in hole left by a removed pushbutton or 0.5 in conduit fitting. It is not for users who need to pass cables through the opening, nor for applications requiring a non-metallic or hazardous-location rated plug. Buyers looking to seal larger or smaller diameter holes will need a different size.

0.87 inch hole diameter is the critical fit

The single specification that decides compatibility is the 0.87 in hole diameter. The seal is manufactured to snap into or cover this exact opening. If the enclosure knockout or drilled hole measures a different diameter, the part will not seat correctly and the enclosure rating will be compromised. Verify the hole size before ordering.

Highlights

  • Seals 0.87 in openings against dust and moisture
  • Fits 0.5 in conduit knockouts for clean enclosure finish
  • Steel construction resists corrosion in harsh environments
  • Eliminates unused pushbutton holes to maintain NEMA rating
  • Ready-to-install design saves time on panel assembly

Specifications

BrandNVENT HOFFMAN
TypeElectrical Replacement Parts

Questions about this item

What does the 0.87 in hole diameter mean for conduit compatibility?

It matches a standard half-inch conduit opening so the seal covers the unused hole completely.

What mounting surface and hardware does the steel seal require?

It fits flat against the electrical box around the 0.87 in opening and is held by the box’s existing locknut or screw.

How is the seal installed and what step is often missed?

Place the steel disc over the hole, thread the locknut or drive the screw, and tighten until the gasket compresses evenly.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.