why do you crimp the connector 3x? One for each wire, what is the 3rd?

I’m not sure why you have to crimp 3x’s unless their tool is designed that way? I only crimped twice in my engine compartment of my pickup and have had no issues.

Will these work for 10/2 wire at 230V and 20 amps?

You should be able to use on 230 volt 20 amp. The yellow should handle 30 amp minimum. Usually if the wires fit in it. It will work

Do you have the Butt connectors that are 12-10 on one end and 16-14 on the other

No, they are the same on each end. The colors indicate the size, as well they are labeled.

Can these be submerged? I want to use them for a bilge pump.

Yes you can, the discription of the product says they are Marine Grade Waterproof Wire Connectors.

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haisstronica 200PCS Marine Grade Heat Shrink Butt Connectors,26-10 Gauge Wire Connectors-Tinned Red Copper Waterproof -Butt Splice Connectors(4Colors/4Sizes)

haisstronica 200PCS Marine Grade Heat Shrink Butt Connectors,26-10 Gauge Wire Connectors-Tinned Red Copper Waterproof -Butt Splice Connectors(4Colors/4Sizes)

Product ID: 273518390

Details

Colour
Blue Yellow
Connector type
Butt Splice
Contact material
Copper
Insulation material
Polyolefin
Terminal
Butt Terminal

⚡Tinned copper core for superior conductivity

💧Waterproof polyolefin shell resists corrosion

🔥Hot melt adhesive ensures secure, lasting splice

Description

🔌 Connect with confidence — splice smarter, last longer!

DIY FRIENDLY DESIGN - Easy to use with common tools, perfect for professional and home projects
MARINE GRADE DURABILITY - Engineered with corrosion-resistant polyolefin for harsh environments
RELIABLE WATERPROOF SEAL - Integrated hot melt adhesive locks out moisture and prevents wire detachment
VERSATILE GAUGE COMPATIBILITY - Fits 26-10 gauge wires across 4 color-coded sizes for precision
ENHANCED ELECTRICAL PERFORMANCE - Tinned copper core maximizes conductivity and wire grip

The haisstronica 200PCS Marine Grade Heat Shrink Butt Connectors feature a tinned copper core for enhanced electrical conductivity, a durable polyolefin shell resistant to corrosion and chemical erosion, and a hot melt adhesive lining that ensures a waterproof, secure splice. Designed for 26-10 gauge wires, these connectors come in four color-coded sizes, making them ideal for both professional and DIY electrical projects requiring reliable, long-lasting connections.

Specifications

ASIN	B07RX6QYX5
Best Sellers Rank	65,136 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 72 in Butt Terminals
Brand	haisstronica
Colour	Blue Yellow Red White
Connector Gender	Male
Connector Type	Butt Splice
Contact Material	Copper
Customer Reviews	4.7 4.7 out of 5 stars (2,117)
Insulation Material Type	Polyolefin
Item Dimensions L x W x H	25L x 25W x 25H millimetres
Manufacturer	haisstronica
Manufacturer Part Number	HX1053
Material	Polyolefin
Maximum Voltage	600 Volts (DC)
Model Number	HX1053
Number of Items	200
Specification Met	CE
Stud Size	10 gauge
Terminal	Butt Terminal
UPC	192687289905

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