Waterproof Heat Shrink Butt Connectors — Solder-Seal Wire Splicing for Any Environment
Loose wire connections that corrode, arc, or fail under vibration are a constant headache for anyone working on boats, vehicles, or outdoor electrical systems. These 100Pcs Waterproof Heat Shrink Butt Terminals give you a professional-grade, moisture-proof splice in minutes — no soldering iron, no crimping tool required.
Each connector features a dual-wall polyolefin heat shrink tube with an integrated tin solder ring and hot melt adhesive lining. The kit covers four AWG ranges — White (26-24 AWG), Red (22-18 AWG), Blue (16-14 AWG), and Yellow (12-10 AWG) — with 100 pieces distributed across all four sizes so you always have the right connector on hand.
Whether you're rewiring a bilge pump, splicing trailer lighting harnesses, repairing automotive sensor wiring, or tidying up a home workshop project, these solder seal sleeves deliver a gas-tight, waterproof connection that holds up to heat, vibration, and moisture exposure.
✅ Compatible with copper and tinned copper wire from 26 AWG to 10 AWG (0.25–6.0 mm²) — suitable for marine, automotive, aircraft, RV, and general electrical wiring applications.
Key Features
- 🔒 Waterproof Dual-Wall Construction — Polyolefin outer tube shrinks tightly around the connection while the inner hot melt adhesive flows into wire strands, creating a fully sealed, moisture-proof joint.
- 🔥 Built-In Solder Ring — Tin solder ring melts and flows into the wire strands when heated, forming a gas-tight electrical connection without a soldering iron or crimping tool.
- 🎨 4-Size Color-Coded Kit — White (26-24 AWG / 0.25–0.34 mm², 25pcs), Red (22-18 AWG / 0.5–1.0 mm², 35pcs), Blue (16-14 AWG / 1.5–2.5 mm², 30pcs), Yellow (12-10 AWG / 4.0–6.0 mm², 10pcs) — 100 pieces total.
- 💪 Strong Tensile Strength — The combination of solder bond and heat-shrunk adhesive sleeve provides excellent pull-out resistance and tear resistance under vibration and mechanical stress.
- ⚡ Super Flexible After Shrinking — Remains pliable once cooled, making it ideal for wiring runs that flex or move, such as door harnesses, trailer cables, and marine rigging.
- 🛠️ Heat Gun Activated — 3-Step Process — Strip 0.75 cm of insulation, thread the sleeve onto the wire and position at the joint, then apply heat gun until the solder melts and the tube shrinks. No crimper or open flame needed.
What's in the Box
- 25× White connectors — AWG 26-24 (0.25–0.34 mm²)
- 35× Red connectors — AWG 22-18 (0.5–1.0 mm²)
- 30× Blue connectors — AWG 16-14 (1.5–2.5 mm²)
- 10× Yellow connectors — AWG 12-10 (4.0–6.0 mm²)
- 1× Plastic storage case
Who Is This For
🚤 Marine & Boating Enthusiasts
Salt air and constant moisture destroy standard butt connectors fast. These waterproof solder seal sleeves keep bilge pump wiring, navigation lights, and fish finder connections corrosion-free season after season.
🚗 Automotive & Trailer DIYers
Splice trailer lighting harnesses, repair sensor wiring, or add accessories to your vehicle without worrying about vibration loosening the joint or road moisture causing shorts.
✈️ Aircraft & RV Technicians
Where weight, reliability, and moisture resistance all matter, these connectors meet the demands of avionics wiring repairs and RV electrical system upgrades.
🔧 Home Workshop & General Electrical Repair
From outdoor lighting extensions to appliance cord repairs, the color-coded size range means you always have the right connector for the job without hunting through a disorganized parts bin.
Technical Specifications
| Product Type |
Waterproof Heat Shrink Solder Seal Butt Connectors |
| Total Quantity |
100 Pieces |
| Material |
Polyolefin Heat Shrink Tube + Hot Melt Adhesive + Tin Solder Ring |
| Color / AWG / Conductor Range / Qty |
White / 26-24 AWG / 0.25–0.34 mm² / 25pcs
Red / 22-18 AWG / 0.5–1.0 mm² / 35pcs
Blue / 16-14 AWG / 1.5–2.5 mm² / 30pcs
Yellow / 12-10 AWG / 4.0–6.0 mm² / 10pcs |
| White — Dimensions |
Length (L): 26 mm | Outer Dia. (A): 1.7 mm | Wire Entry (B min.): 1.0 mm | Wire Entry (B&C max.): 1.7 mm | Solder Zone (C min.): 0.76 mm |
| Red — Dimensions |
Length (L): 40 mm | Outer Dia. (A): 2.7 mm | Wire Entry (B min.): 1.4 mm | Wire Entry (B&C max.): 2.7 mm | Solder Zone (C min.): 1.2 mm |
| Blue — Dimensions |
Length (L): 40 mm | Outer Dia. (A): 4.5 mm | Wire Entry (B min.): 2.3 mm | Wire Entry (B&C max.): 4.5 mm | Solder Zone (C min.): 2.0 mm |
| Yellow — Dimensions |
Length (L): 40 mm | Outer Dia. (A): 6.0 mm | Wire Entry (B min.): 3.7 mm | Wire Entry (B&C max.): 6.0 mm | Solder Zone (C min.): 3.4 mm |
| Activation Tool |
Heat Gun (recommended); open flame not recommended |
| Package Weight |
Approx. 120 g |
Frequently Asked Questions
Can I use a lighter or heat gun to activate these connectors?
A heat gun is strongly recommended. Open flames (lighters, torches) can overheat the connector unevenly, causing the solder to flow before the tube fully shrinks or scorching the outer sleeve. A heat gun set to 150–200°C gives consistent, controlled results.
What is the correct AWG size for my wire?
Match the color to your wire gauge: White for 26-24 AWG (0.25–0.34 mm²), Red for 22-18 AWG (0.5–1.0 mm²), Blue for 16-14 AWG (1.5–2.5 mm²), and Yellow for 12-10 AWG (4.0–6.0 mm²). Using a connector that is too large will result in a poor solder bond and incomplete seal.
Are these connectors truly waterproof after shrinking?
Yes. When properly heated, the hot melt adhesive flows into the wire strands and the polyolefin tube shrinks tightly around the insulation, creating a moisture-proof seal. They are suitable for marine, outdoor, and under-hood automotive environments.
Do I need to strip the wire before inserting it?
Yes. Strip approximately 0.75 cm (about 5/16 inch) of insulation from each wire end before inserting into the connector. This exposes enough conductor for the solder ring to make a solid electrical connection.
Can these be used for aluminum wiring?
These connectors are designed for copper and tinned copper wire. Aluminum wiring requires specialized connectors with anti-oxidant compound; using standard tin solder on aluminum may result in a poor or unreliable connection.
How many of each size are included in the 100-piece kit?
The kit contains 25 White (26-24 AWG), 35 Red (22-18 AWG), 30 Blue (16-14 AWG), and 10 Yellow (12-10 AWG) connectors, all stored in a reusable plastic compartment case.
Can I reuse or remove a connector once it has been shrunk?
No. Once the solder has flowed and the tube has shrunk, the connection is permanent. To remove it, you would need to cut the wire and re-splice. This is by design — the permanent bond is what makes the connection reliable in harsh environments.
Ready to make clean, waterproof wire connections? Add the 100Pcs Waterproof Heat Shrink Butt Terminals to your cart and tackle your next wiring project with confidence.
