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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120PCS Solder Seal Wire Connectors

Product ID: 144102933

Details

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

⚡Supports up to 600V max voltage

💧Double-wall waterproof seal

🔥Heat shrink activates at 80℃

¥3064

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal the deal with every connection—waterproof, durable, and hassle-free!

BUILT FOR HARSH ENVIRONMENTS - Abrasion-resistant polyolefin tubing shields wires from cuts, scuffs, and impacts.
UNMATCHED WATERPROOF PROTECTION - Double-wall tubing with hot melt adhesive locks out moisture and prevents wire slippage.
OPTIMIZED ELECTRICAL PERFORMANCE - Tin-plated copper barrels reduce voltage drop and ensure reliable current flow.
EFFORTLESS PERMANENT CONNECTIONS - Solder melts and flows seamlessly for a rock-solid bond—no crimping tools needed.
VERSATILE READY FOR ANY PROJECT - Perfect for automotive, marine, RV, and outdoor electrical repairs—join the pros who trust Sopoby.

The Sopoby Solder Seal Wire Connectors kit includes 120 heat shrink butt terminals featuring a double-wall design with hot melt adhesive for superior waterproofing. Operating between -67℉ and 257℉, these connectors support up to 600 volts and use abrasion-resistant polyolefin tubing to protect wires in demanding environments. Ideal for automotive, marine, and outdoor electrical projects, they provide a permanent, reliable connection without the need for crimping tools.

Specifications

ASIN	B07S62KYSL
Best Sellers Rank	#12,801 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #70 in Butt Terminals #3,779 in Electrical Equipment
Brand Name	Sopoby
Color	Yellow, Blue, Red, White
Connector Gender	Male
Connector Type	Solder
Contact Material	Copper
Customer Reviews	4.6 out of 5 stars 15,416 Reviews
Insulation Material	Polyolefin
Insulation Material Type	Polyolefin
Item Highlight	120PCS Insulated Automotive Marine Electrical Wire Terminals
Manufacturer	Sopoby
Material	Polyolefin Tubing with Hot Melt Adhesive & Solder inside
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
Wire Diameter	1.7 millimeters

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