Built for buried, wet, out-of-sight connections—where failures cause big problems.
Cheaper sleeves can shift during installation, allowing moisture to reach the electrical connection.
Direct flame can burn the material and damage protection.
Heating from one end can leave gaps and air pockets.
Poor materials cause loose connections, failures and callbacks.
Creates a secure, watertight seal that locks out moisture and protects the electrical connection.
Heating evenly from the center outward protects the sleeve and creates a consistent seal.
Shrinks smoothly for a tight, reliable waterproof seal.
Heavy-duty materials help prevent loose connections, failures and costly callbacks.
Available in black and clear tubing for secure, sealed splice connections.
Step 1
Choose a splice kit that matches the wire gauge printed on your cable.
Decision Guide
All kits include: Heat Shrink Tubes • Seamless Plated Copper Connectors • Adhesive- and Sealant-Lined Tubing
Transparent tubing allows easy visual inspection.
Adhesive lined for a secure, watertight bond.
Built for marine, UV, chemical, and extreme-temperature exposure.
Black tubing provides excellent UV resistance and durability.
Adhesive + sealant lined for a secure, watertight bond.
Thick-wall construction provides added strength and abrasion resistance.
Tight. Sealed. Moisture Protected.
See what customers are saying about Merrill waterproof wire-splice kits.
This is definitely the most heavy-duty shrink tube I have used. It is very thick, and the crimp connectors are very robust.
I can definitely see why it is rated for underground and marine applications. Very nice kit.
Turnkey parts in a box. Quality components.
As advertised and pictured.
With the right crimping tool and heat gun or torch, this kit has everything needed to make waterproof wire connections.
The connectors and heat-shrink tubing are ideal for well-pump wiring using #8, #10, #12 and #14 AWG wire.
The pre-cut tubes are long enough to provide lasting protection, potentially for the service life of the well pump.
Choose a waterproof splice kit that matches your wire size and application. For underground repairs and direct-bury installations, Merrill offers heat-shrink splice kits in several common wire sizes.
A dependable splice kit should be watertight, easy to install, and built for long-term performance. Merrill’s adhesive-lined heat-shrink design helps create a durable, sealed connection.
Code requirements depend on the wire type, application, and installation location. Always use a listed splice kit that matches your system and local electrical requirements. Merrill offers splice kits for submersible-pump and pump-motor applications in multiple wire sizes.
Look for an underground splice kit designed for direct-bury use and protection against moisture. Merrill’s black and clear heat-shrink splice kits are built for underground and submersible applications.
Use a waterproof splice kit with adhesive-lined heat-shrink tubing and correctly sized crimp connectors. Merrill’s inner adhesive and sealant help create a secure, long-lasting watertight seal.
Match the splice kit to your wire size, installation location, and application. Determine whether the connection will be underground, submerged, direct buried, or exposed to moisture before selecting your kit.
That small connection can determine whether the entire system works or fails. When properly installed and sealed, it can be buried once and trusted for years—without callbacks, downtime, or unnecessary safety concerns.
