HKS Heat Shrink Butt Connector Red 22-16 AWG - Waterproof Crimp

In this review we look at the HKS heat shrink butt connector kit for 22-16 AWG wires and whether it delivers a reliable, weatherproof splice for automotive and marine use. The bottom line: this kit is best for DIYers, mechanics and boat owners who need a straightforward, durable crimp solution because the 0.7mm tinned red copper barrel and adhesive-lined heat shrink combine to form a secure, waterproof joint without soldering. The review focuses on real-world usability, durability in damp environments and whether the connectors hold up under typical electrical loads.

Key Features

• Tinned copper barrel: the 0.7mm thickness red copper barrel provides a firm crimp that helps prevent wire pull-out and improves electrical contact.
• Heat shrink with adhesive: the tubing has an inner adhesive lining that activates with heat to seal the wire ends from moisture and corrosion.
• High shrink ratio: the insulation tubing shrinks to about one third of its original size to conform tightly around irregular splices and provide strain relief.
• Easy identification: color coding and wire gauge imprint make it simple to pick the right connector for 22-16 AWG without guessing.
• Marine grade protection: rated to IP67 levels of waterproofing, these connectors are suitable for boats, motorcycles and vehicles exposed to weather.
• Tool-free sealing step: after crimping, applying heat with a heat gun creates a durable seal without the need for soldering.

Who It's For

These heat shrink butt connectors are aimed at hobbyists and professionals who perform wiring on cars, boats, motorcycles and general household electrical projects and need a fast, repeatable method to join 22-16 AWG conductors. The waterproof seal and tinned copper barrel make them particularly useful for marine or outdoor applications where corrosion is a concern.

Those who should look elsewhere include installers requiring a permanent soldered joint for very high current or vibration-critical aerospace applications, or users who need connectors for wire sizes outside the 22-16 AWG range covered by this kit.

Pros & Cons

Pros

• Strong crimps from the 0.7mm tinned copper barrel reduce the chance of wire slippage and improve conductivity.
• Heat-activated adhesive lining creates a reliable moisture barrier for marine and outdoor use.
• Color-coded terminals with gauge imprint make selection quick and reduce mistakes during installation.
• Easy to use with a standard crimper and heat gun, no soldering required, so jobs finish faster.

Cons

• Some users report mixed results on the heat shrink function, so careful heating technique is required to ensure full adhesive activation.
• Not suitable for wire sizes outside the stated 22-16 AWG range, so additional connector sizes are needed for larger jobs.

Specifications

Product type	Heat shrink butt connector
Wire gauge	22-16 AWG
Barrel material	Tinned red copper, 0.7mm thickness
Insulation	Heat shrink tubing with adhesive lining
Waterproof rating	IP67 (marine grade)
Application	Automotive, marine, stereo, boat crimp
Quantity	1000 pieces (red connectors, 22-16 AWG)

Our Verdict

These HKS heat shrink butt connectors are a practical, cost-effective choice for anyone needing reliable 22-16 AWG splices in wet or outdoor environments. The combination of a 0.7mm tinned copper barrel and adhesive-lined tubing delivers strong crimps and good moisture resistance, making them a strong value for automotive, marine and general wiring tasks where soldering is impractical.

Frequently Asked Questions

Are these connectors waterproof?
Yes, the connectors use adhesive-lined heat shrink tubing that forms a watertight seal and the product is described as marine grade with an IP67 waterproof rating.

What wire sizes do they fit?
These red butt connectors are intended for 22-16 AWG wires and are color-coded to help identify the correct gauge.

Do you need soldering?
No, the kit is designed to create a secure, sealed connection using a crimper and heat to activate the adhesive lining, so soldering is not required.