NDT Seals, Inc Inspection Plugs

NDT Seals, Inc Inspection Plugs

Easy, Resealable Access for NDT Testing of Insulated Pipe and Equipment


Install Once and Inspect as Often as you Choose

Inspection Plugs by NDT Seals, Inc. provide easy, resealable access for NDT testing of insulated pipes and equipment, reducing time taken for periodic inspections or tests from the likes of OSHA or the EPA. The NDT Inspection Plug consists of an elastomer sleeve and a metal cap (with or without handle), lanyard and locking ring. The elastomer sleeve is available in either EPDM (ethylene propylene) or silicone. The metal cap and optional handle are available in either 5052 aluminum or 304 stainless steel, and all lanyards are 304 stainless steel. Also available are hole saws, arbors and TML Inspection Point Labels. See pricing table below for a full list of variants available.


  • Reusable
  • EPA and OSHA inspection point access
  • Reduces time for periodic inspections / tests
  • Installs on both smooth and corrugated jacketing
  • No special tools, O-rings, transition gaskets, contoured flanges or "goof" plates required
  • Patented design seals and protects against corrosion under the insulation (CUI), chemical and UV exposure of the elastomer sleeve
  • Lanyard stops plug cap loss
  • Available in 1.5, 2.5, 3.0 and 5.0 inches (38, 64 , 76 and 127 mm) sizes with or without handle, lanyard and locking ring

Inspection Access Procedure:

  1. Locate and mark the insulation jacket where the test is required
  2. Use either tin snips or hole saw to penetrate the insulation
  3. Remove the final layer of insulation in the safest and most convenient manner (using your hand or knife) to expose the substrate for electronic and
  4. visual inspection.
  5. After inspection, re-insert the insulation or replace with high density material.
  6. Insert the Sleeve. (Caulk around the sleeve for cold applications is recommended.)
  7. Secure the Locking Ring and Lanyard (if applicable).
  8. Insert the Plug Cap to affect a seal.

Elastomer Sleeve Specifications:

The elastomer sleeve is available in either EPDM (ethylene propylene) or silicone

  EPDM Silicone
Color Black Grey
ASTM Designation D2000 2BA 510 A14 B13 C12 F17 D2000 2GE 506 A19 B37 F19
Temperature Range -65° to 300°F / -54° to 149°C -65° to 400°F / -54° to 204°C
Ozone Resistance Excellent Excellent
Weathering Resistance Excellent Excellent

Design Specifications:


Available Plug Sizes

Recommended for Insulation
Jacket OD

1.5" (38 mm)

2.5" (64 mm)

3.0" (76 mm)

5.0" (127 mm)

Small Diameter Piping

Minimum 6 in. (125 mm)

Minimum 9 in. (229 mm)

Vessels & Equipment

Volume Pricing available for 500+ of 1.5"-3.0" Plugs and 50+ of 5.0" Plugs. Contact us for volume pricing.

Minimum order size $150.00 to avoid $25.00 small order fee. Can combine with other products to reach minimum.

Product Literature

Description Part # Saved Price Select Option Add to
NDT Seals Inspection Plugs - Aluminum/EPDM
Model #
UT-NS-AG3-0001-Master $13.00
NDT Seals Inspection Plugs - Aluminum/Silicone
Model #
UT-NS-AG3S-0001-Master $15.00
NDT Seals Inspection Plugs - Stainless Steel/EPDM
Model #
UT-NS-SG3-0001-Master $15.00
NDT Seals Inspection Plugs - Stainless Steel/Silicone
Model #
UT-NS-SG3S-0001-Master $17.00