Is it possible to make a 3-way connection with these?

It is possible, yes, but it’s a little tricky. Two of the wires end up being twisted together and inserted into one side and the third wire ends up on the other side. You’ll likely have to use the next size up to accommodate the double strand. I’d recommend adding heat shrink to the side with the single wire, as it may not seal as well as the other side, since it’s stepped up. The connections I made this way have been in service on my car for more than two years without any issue.

Do these connectors work on 14 awg solid copper wire (in 14/2 waterproof cable) laid underwater to a small island (110 vac)?

Hi friend, we are so sorry to tell you that these solder connectors are not suitable for solid copper wire. Actually they are designed for stranded wire. We recommend you to use heat shrink crimp butt connectors. It woule be safer for your projects after the solid copper wire being crimped and heat shrinking. If you have any additional questions, just contact us seller. We will do our best to assist you. Thank you!

Can this be used with AC electrical?

It can be used with any wire. You have to find the size that you need. My husband used it on a beacon light that goes on top of your vehicle and it works really good.

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Description

🔧 Seal the deal with every connection — don’t let your wiring fall behind!

VERSATILE COLOR CODED KIT - 120 connectors in 4 sizes/colors for precise, professional wiring on automotive, marine, and DIY projects.
DURABLE ABRASION PROTECTION - Premium polyolefin tubing shields wires from cuts, scuffs, and harsh environments.
EFFORTLESS ONE STEP CONNECTION - Heat activates solder ring and adhesive simultaneously for a secure, time-saving bond.
OPTIMIZED ELECTRICAL PERFORMANCE - Tin-plated copper barrels ensure superior current flow and minimize voltage drop.
UNMATCHED WATERPROOF RELIABILITY - Double-wall tubing with hot melt adhesive locks out moisture, perfect for marine and outdoor use.

The Sopoby 120PCS Heat Shrink Solder Seal Wire Connectors kit offers a professional-grade, waterproof, and abrasion-resistant solution for reliable electrical connections. Featuring a one-step solder and seal process, color-coded sizes, and compliance with CE, ISO, RoHS, and SGS standards, this kit is engineered for automotive, marine, and outdoor applications requiring durable, high-performance wire terminals.

Specifications

Colour	Yellow, Blue, Red, White
Connector Type	Ring
Contact Material	Copper
Insulation Material	Polyolefin
Terminal	marine,solder,terminals
Material	Solder
Brand	Sopoby
Specification Met	CE, ISO 9001, RoHS, SGS
Temperature Rating	125 degree celsius
Maximum Voltage	600 Volts
Net Quantity	120 Count
Manufacturer	Sopoby
Country of Origin	USA
Model number	Sopoby334
Special Feature	1 Step Solder and Seal Process
Item Weight	100 g
Package Dimensions	19 x 10.9 x 1.6 cm; 100 g
Item model number	Sopoby334
Voltage	12 Volts
Power Source	corded electric
Are batteries included?	No

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