Skip to main content Skip to navigation

Sealing and Caulking Cords

  • Hot or cold applications
  • Flexible at -20ºF and non-sagging up to 350ºF
  • Self adhesive and easy to apply
  • Non-staining and non-hardening
  • Water and vapor proof with no odor - white in color
  • Non corrosive to metals
  • Seal duct work and other HVACR jobs


This compound is formulated and manufactured for use in many sealing, insulating, and general maintenance applications. It has excellent adhesion capability and is non-staining, non-hardening, and unaffected by wide variations in temperature. Sealing and Caulking Cords are available in 3/8˝ pre-shaped extruded cords, with serrated release paper.

For Refrigeration
  • Seal out air and moisture
  • Seal around tube entries
  • Seal under latch plates
  • Seal under hinges
  • Seal over screw head

For Air Conditioning

  • Seal window openings
  • Seal air ducts
  • Seal adaptors and extensions
  • Seal air, dust, and moisture

Packaging Size Part Number Additional Info
3/8 inch x 25 foot Roll 4216-27


This product must be used in accordance to the following directions by HVACR professionals only.

  • Cords are arranged between paper so that one cord at a time may be uncoiled or the entire group unrolled.
  • No tools are required, press cords in place with thumb or forefinger - no mess, no smear.
  • Openings must be clean, free of moisture, grease or loose particles. Adheres to any clean, dry surface.

Product Information:

Literature Downloads

Download the product bulletin and other relevant literature here.


Download a low resolution file of the product label here.

Product Safety

RTK Information

2611 Schuetz Rd. St. Louis, MO 63043
  • Telephone: 800.554.5499
  • Email:
  • Hours: Mon–Fri: 8:00am - 5:00pm (Central Time)

We'd love to hear from you.

We'd love to hear from you.

Click the box to submit