Under Pressure Pipe, Joint & Crack Repair Kits By Neptune Research, Inc.

Repairs broken or cracked pipes and joints under pressure. Ready to use, heat resistant, no mixing, no mess, sets rock hard in minutes.

Product Information

One pressure repair kit by Neptune Research, Inc. (NRI) now easily fixes joints, leaks and cracks under pressure for pipes up to 6" diameter (152.4 mm). Larger diameter pipes are also repairable using the Neptune Syntho-Glass® and Syntho-Glass® XT systems.

Typical Applications

  • Under pressure leaks

  • Leaking joints

  • Live pinhole leaks

  • Dripping lines

  • Emergency Repair


  • No shut-down necessary

  • Ready to use

  • Repair of pipes under pressure up to 60 psi

  • Heat Resistant

  • Effective time saving

  • No mixing & no mess

  • Sets rock hard

Pressure Repair Kit Contents

  • Syntho-Glass®

  • Butyl Strip

  • Pressure Sealing Rubber Tape

  • Gloves

  • Instructions


Physical Properties

Resistance Temperature to Heat
Resistance Temperature to Cold
Gasoline & Oil
Low Concentration Mineral Acid
High Concentration Mineral Acid
High Concentration Alkali
Low Concentration Alkali


Mechanical Properties

Tensile Strength
Flexural Strength
Dielectric Strength

38,000 psi
18,000 psi
16,000 volts

Preparation & Application
(Maximum pressure use of UP kit is 60 psi)
Installation Guide in pdf Format

1a. JOINT: Cut the provided butyl strip to be sure that it wraps around the entire joint and the ends meet. Begin wrapping rubber tape on the outer half and work towards the leaking joint by stretching the tape to its maximum tension. Use entire roll of pressure tape and continue to wrap until the leak has stopped.
1b. CRACK: Use only the Rubber tape and be sure that the butyl patch, which has been pre-mounted to the rubber tape, goes directly over the leaking area. Begin wrapping tape by stretching to its maximum tension DIRECTLY over the repair area until it has stopped. DO NOT CHASE THE LEAK as each wrap provides additional pressure over the leak.
2. Remove Syntho-Glass® from foil pouch using enclosed gloves. Soak in temperate water for 20 seconds.
3. Tightly wrap Syntho-Glass using entire roll. Wrap approximately 2” above and below the repair and directly over the rubber tape.
4. Squeeze and mold Syntho-Glass in the direction of wrap, removing excess water and spreading resin until tacky to touch (approximately  3 min). Wait 30 min at 75°F before returning to normal operating pressure.
Ordering Information
Pipe Diameter Roll Size Kit #
1/2" - 1"
1-1/4" - 2"
2-1/2" - 4"
4-1/2" - 6"
2" x 5"
3" x 9'
4" x 15'
4" x 30'