TECH Tire Repairs Permacure II 3-3/4" Tubeless Tire Insert Plugs, Box of 50 — Nylon-Reinforced, Vulcanizing-Compatible

TECH Tire Permacure II insert plugs are reinforced tubeless tire repair inserts that chemically bond to the tire for durable, temporary roadside repairs.

These 3-3/4 inch Permacure II plugs from TECH Tire Repairs are designed for fast, reliable insertion into tubeless tire punctures. Made with a nylon-reinforced core and formulated to work with vulcanizing fluids like TECH Flow-Seal, these plugs offer a secure seal that resists moisture and contaminants. Sold in a box of 50, they’re sized and shaped for passenger vehicles, light utility tires, lawn equipment, and many UTV/ATV applications.

How do these inserts hold up compared with standard string plugs?

Permacure II plugs use an engineered compound and internal reinforcement to remain in place rather than relying solely on tacky material. When used with a vulcanizing fluid, the repair becomes a chemical bond to the tire rubber rather than a simple mechanical filler.

• Reinforced core reduces extrusion and breakage during installation
• Compound resists drying and deterioration over time
• Designed to seal out water and road contaminants

What tools and materials are needed for a proper repair?

Basic tubeless plug repair tools plus TECH Flow-Seal vulcanizing fluid yield the best result. You’ll need a reamer and an insertion tool suited for 3-3/4 inch inserts and a clean rag for prep.

• Insertion tool compatible with 3-3/4" plugs
• Reamer/tire rasp to prepare the hole
• TECH Flow-Seal vulcanizing fluid for chemical bonding
• Safety gloves and tire gauge for final checks

Are these plugs a permanent fix or a temporary solution?

TECH Permacure II plugs are engineered to create a long-lasting seal when installed correctly and combined with vulcanizing fluid, but they are generally considered a semi-permanent roadside repair. For driven-on tires and highway speeds, many technicians recommend a professional inspection or patch/plug combination from inside the tire when possible.

• Excellent for emergency repairs and extended use on non-highway tires
• For sustained highway use, follow up with a shop inspection
• Work across cars, lawn mowers, UTVs, and similar tires

What tire types and puncture sizes do these 3-3/4" inserts fit?

The length and profile of the 3-3/4 inch Permacure II make them suitable for many passenger and light utility tires with through-hole punctures. They’re best for punctures large enough to accept the insert but not for sidewall tears or large gashes.

• Commonly used on passenger cars, light trucks, UTVs, and lawn equipment
• Suitable for straight punctures caused by nails, screws, and similar objects
• Not intended for sidewall damage or large structural failures

Who is this for? TECH Tire Permacure II 3-3/4" insert plugs are aimed at mechanics, fleet managers, roadside technicians, and homeowners who need a dependable tubeless repair option. If you maintain vehicles or equipment that operate off-road, around the yard, or on city streets and want a repair that resists drying and contamination, this bulk box of 50 provides ready supplies for repeated emergency or maintenance repairs. Keep in mind that pairing the plugs with TECH Flow-Seal vulcanizing fluid and following proper installation steps gives the strongest results.