do these fit the JB weld 25ml epoxy tubes?

I don't know about JB Weld. I bought this for 3M Scotch-Weld 08966 Epoxy Adhesive DP420 50mL, DP420, Black

Will they fit adhesive technology JF-311 cartridges?

Tried to look on the site only cartridges I saw were larger than the 25/50ml cartridge these are used for. I would doupt it.

Does this fit 2:1 ratio?

Yes! Good For 1:1 and 2:1 ratio formulas

Where does one purchase the 'needle' tip shown in the sales photo?

Those nozzles with the large round base are available on Amazon ... but they do NOT fit the dual tube Hysol adhesive cartridge. That cartridge requires the end with the flat sides so it will fit onto the outlet and twist-lock into place.

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Mixing Nozzles Adhesive Cartridges Tip for 50ml Resin Mixer Adhesive Applicatior 16-Element, 3.6in, 1:1 & 2:1 ratios(20 Pieces)

Product ID: 166136556

Details

Brand
FRIGIIRE
Item Form
Paste
Material
Plastic
Special Feature
High Nozzles
Specific Uses For Product
Repair

📏3.6-inch precision length

♻️50% less adhesive waste

⚙️16-element high-efficiency mixer

€ 31.24

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Mix it right, waste less, bond stronger!

BULK PACK ADVANTAGE - 20-pack supply keeps your projects flowing without interruption—never run out mid-job.
COMPACT COMPATIBLE - 3.6-inch length fits all standard 50ml B-System dual-barrel cartridges for versatile use.
ECO SMART EFFICIENCY - Reduces adhesive waste by 50%, saving money and minimizing environmental impact.
UNIVERSAL BONDING POWER - Optimized for metals, wood, plastics, rubber, masonry, and PCB mounting—one nozzle to rule them all.
PRECISION MIXING MASTERY - 16 internal elements ensure flawless, bubble-free adhesive blending every time.

The FRIGIIRE Mixing Nozzles are 3.6-inch, 16-element high-efficiency tips designed for 50ml dual-barrel epoxy cartridges with 1:1 and 2:1 ratios. Compatible with a wide range of materials, these nozzles reduce adhesive waste by 50%, ensuring precise, consistent mixing for professional-grade bonding across metals, wood, plastics, rubber, and masonry. Sold in a convenient 20-piece pack, they are a must-have for efficient, clean, and reliable adhesive application.

Specifications

ASIN	B07Y1DGHZB
Best Sellers Rank	#36,015 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #21 in Adhesive Dispenser Accessories
Brand	FRIGIIRE
Brand Name	FRIGIIRE
Color	green
Compatible Material	Plastic, Rubber, Wood
Container Type	Cartridge
Customer Reviews	4.6 out of 5 stars 302 Reviews
Item Form	Paste
Item Package Quantity	1
Item Weight	0.27 g
Manufacturer	What's news
Material	Plastic
Material Type	Plastic
Model	PEG_USK-03JUNE23-B083JKDNRJ
Number of Pieces	20
Other Special Features of the Product	High Efficiency Nozzles Reducing Adhesive Waste by 50%
Part Number	PEG_USK-03JUNE23-B083JKDNRJ
Special Feature	High Efficiency Nozzles Reducing Adhesive Waste by 50%
Specific Uses For Product	Repair, Woodworking
UPC	745103917670
Unit Count	20 Count
Viscosity Level	High
Volume	50 ml
Water Resistance Level	Not Water Resistant

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