Is it a 1.8, 2.1 or 2.3 mm

The #100775 injector has a 2.1mm orifice.

my pressure washer is 3100psi @ 2.8 gpm. Is this chemical injector the correct/best one for my washer? Thanks in advance for your help -d

This injector may work ok but a better option would be General Pump #100774 which is for 2-3 GPM machines. Amazon item #B01JB6D0YG

I have 3200 psi /2.6gpm would this work and does the tube for trasporting the liquid come included?

I would suggest General Pump Model #100774 (Amazon Item #B01JB6D0YG) which is for 2-3 GPM machines. The suction tube is not included. Amazon item #B00O45UHUU would work great.

What size is the threading ?

Both sides are 3/8" NPT threads.

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⚡ Elevate your cleaning game with precision and durability!

BUILT TO LAST - Crafted from premium brass for unmatched corrosion resistance and longevity.
COMPACT LIGHTWEIGHT - At just 0.01 ounces and slim dimensions, it fits seamlessly into your pressure washer setup.
ENERGY FREE OPERATION - Venturi-powered design means no batteries or external power needed—eco-friendly and hassle-free.
EFFORTLESS INTEGRATION - Designed for easy installation with standard pressure washers, boosting your cleaning efficiency instantly.
PRECISION FLOW CONTROL - Delivers a consistent 3-5 gallons per minute for optimal chemical mixing.

The General Pump 3-5 GPM Chemical Injector 100775 is a compact, brass-constructed device engineered to deliver precise chemical injection using a venturi-powered system. It operates efficiently without batteries, handling up to 5 gallons per minute, making it an essential upgrade for professional-grade pressure washers.

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Manufacturer	General Pump
Part Number	100775
Item Weight	0.01 ounces
Product Dimensions	2.2 x 1 x 0.1 inches
Item model number	100775
Is Discontinued By Manufacturer	No
Color	Gold
Style	3-5 GPM
Material	Brass
Power Source	Venturi
Item Package Quantity	1
Flow Rate	5 Gallons Per Minute
Water Consumption	5 Gallons per Minute
Included Components	Brass Chemical Injector Body Only
Batteries Included?	No
Batteries Required?	No

General Pump 3-5 Gpm Chemical Injector 100775

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