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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Solder Seal Wire Connectors, Heat Shrink Waterproof Solder Butt Connectors

Product ID: 144102933

Details

Color
Yellow Blue
Connector Type
Solder
Contact Material
Copper
Insulation Material
Polyolefin
Terminal
Butt Terminal

💧Double-wall waterproof seal with hot melt adhesive

🔥Solder melts at 138℃ for seamless fusion

🛡️Abrasion-resistant polyolefin tubing

€ 23.29

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal the deal with every connection—waterproof, durable, and ready to perform!

VERSATILE FOR EVERY PROJECT - Perfect for automotive, marine, off-road, and even holiday lighting setups—connect with confidence.
UNMATCHED WATERPROOF PROTECTION - Double-wall design with hot melt adhesive locks out moisture and prevents wire slippage.
OPTIMIZED ELECTRICAL PERFORMANCE - Tin-plated copper barrels reduce voltage drop and boost current flow reliability.
EFFORTLESS LONG LASTING CONNECTIONS - Solder ring melts precisely to fuse wires, ensuring a durable, maintenance-free bond.
RUGGED DURABILITY FOR HARSH ENVIRONMENTS - Premium abrasion-resistant tubing shields wires from cuts, scuffs, and impacts.

The Sopoby 120PCS Solder Seal Wire Connectors kit features heat-shrinkable, double-wall insulated terminals with built-in solder rings that melt at 138℃ for secure, waterproof connections. Designed with abrasion-resistant polyolefin tubing and tin-plated copper barrels, these connectors support AWG 26-10 wires, withstand temperatures from -67℉ to 257℉, and deliver reliable electrical conductivity for automotive, marine, and industrial applications.

Specifications

ASIN	B07S62KYSL
Best Sellers Rank	#10,310 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #66 in Butt Terminals #3,199 in Electrical Equipment
Brand Name	Sopoby
Color	Yellow, Blue, Red, White
Connector Gender	Male
Connector Type	Solder
Contact Material	Copper
Customer Reviews	4.6 4.6 out of 5 stars (15,382)
Gauge	AWG 26-10
Insulation Material Type	Polyolefin
Manufacturer	Sopoby
Material Type	Polyolefin Tubing with Hot Melt Adhesive & Solder inside
Maximum Voltage	600 Volts
Model	Sopoby334
Number of Items	120
Part Number	Sopoby334
Specification Met	① Minimum Shrink Temperature: 80℃, ② Minimum Temperature for Solder to Melt: 138℃
Temperature Rating	Working Temp: -67℉ - 257℉
Terminal	Butt Terminal
Unit Count	120 Count

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