Will this tube fit in and function in a "mini grease gun" that uses 3oz cartridges?

yes it should. I am using it in a mini grease gun

Is this safe to use on the threads when sealing my reverse osmosis water purification filters in their cases?

Super Lube 21036 Synthetic Grease is a food grade lubricant listed in it's safety data sheet. I'd use just a thin film. It's a type of non-oxidizing silicone grease with PTFE.

Is this white translucent suitable for u-joints/spiders in pickup trucks?

Manufacture states is GC-LB rated, so I would say yes. I have not used it for that application so I cannot comment on effectiveness.

can we use hand to apply the grease, or must use a grease gun to apply?

Yes, you could remove the grease by hand...you don't need a grease gun.

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GREASE GUN

Product ID: 725439128

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Details

Material
Synthetic
Brand
Super Lube
Package Information
Tube
Liquid Volume
3 Fluid Ounces
Item Weight
3 Ounces

🌡️Wide Temp Range -42.8°C to +450°F

🍽️NSF H-1 Food Grade Safe

🛡️Patented Synthetic NLGI Grade 2

Description

🛠️ Elevate your lubrication game with the grease gun that works as hard as you do!

FOOD SAFE CONFIDENCE - USDA/NSF certified H-1 rating ensures safe use around food processing environments.
UNMATCHED DURABILITY - Lasts 3-4x longer than traditional greases, reducing maintenance downtime.
MESS FREE APPLICATION - Won't drip, run, evaporate, or separate—keeping your workspace clean and efficient.
CORROSION WEAR DEFENSE - Advanced PTFE micro-powder formula protects against friction, rust, and corrosion.
EXTREME TEMPERATURE RESILIENCE - Operates flawlessly from -42.8°C to +450°F, perfect for any industrial setting.

The GREASE GUN by Synco Chemical Corporation features a patented synthetic NLGI Grade 2 lubricant with PTFE micro-powder, delivering superior protection against friction, wear, rust, and corrosion. Certified NSF H-1 food grade safe, it operates across an extreme temperature range (-42.8°C to +450°F) without dripping or evaporating, making it ideal for heavy-duty, multi-purpose industrial and food-contact applications.

Specifications

Manufacturer	Synco Chemical Corporation
Part number	21036
Item Weight	84.9 g
Product Dimensions	33.4 x 9.3 x 3.3 cm; 85.05 g
Is Discontinued By Manufacturer	No
Size	1 pack
Color	Translucent White
Material	Synthetic
Specific Uses For Product	Prevent Corrosion
Included Components	Unit^Instruction Manual
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	33.4 x 9.3 x 3.3 cm

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