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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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330PCS haisstronica Heat Shrink Butt Connectors-Marine Grade Waterproof Electrical Crimp Wire Connectors Kit-Tinned Red Copper Insulated, for Boat,Truck,Stereo,Joint(4Colors/4Sizes)

Product ID: 222847856

Details

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

⚡400V max voltage

🔧330PCS multi-size kit

🛡️Waterproof heat shrink seal

Description

🔌 Seal the deal with every crimp—connect like a pro, waterproof like a boss!

COPPER CORE POWER - Thick, tinned copper core ensures superior conductivity and long-lasting, corrosion-resistant connections.
TRUSTED BY THOUSANDS - 4.8-star rating from 4,600+ pros who demand reliability in automotive, marine, and industrial wiring.
MARINE GRADE DURABILITY - ROHS, ISO 9001, SGS & CE certified connectors built to withstand harsh environments and keep your projects leak-proof.
UNIVERSAL FIT INSTANT CONFIDENCE - 4 color-coded sizes (22-10 AWG) for quick, precise wire matching—no guesswork, no downtime.
HEAT SHRINK TECH WITH HOT MELT ADHESIVE - Translucent tubing with strong tensile strength and inner adhesive guarantees a waterproof, slip-free crimp every time.

The Haisstronica 330PCS Heat Shrink Butt Connectors kit offers a comprehensive, marine-grade solution for electrical splicing with 4 color-coded sizes (22-10 AWG), certified compliance (ROHS, ISO, SGS, CE), and a durable copper core. Featuring translucent heat shrink tubing with hot melt adhesive, these connectors ensure waterproof, corrosion-resistant, and mechanically robust wire joints ideal for boats, trucks, and stereo systems.

Specifications

ASIN	B07Q3JJRY8
Best Sellers Rank	72,071 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 79 in Butt Terminals
Brand	haisstronica
Colour	Blue Yellow Red White
Connector Gender	Male
Connector Type	Butt Splice
Contact Material	Copper
Customer Reviews	4.8 4.8 out of 5 stars (4,862)
Insulation Material Type	Nylon
Item Dimensions L x W x H	20L x 20W x 20H millimetres
Manufacturer	haisstronica
Manufacturer Part Number	HX1045
Material	Polyolefin
Maximum Voltage	400 Volts (AC)
Model Number	HS
Number of Items	330
Specification Met	CE
Terminal	Butt Terminal
UPC	192687298006

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