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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💧 Inject precision, power, and durability into your outdoor cleaning routine!

BUILT TO LAST - Crafted from robust brass to withstand tough outdoor conditions and heavy use.
COMPACT LIGHTWEIGHT - Slim 5.59 x 2.54 x 0.25 cm profile at just 0.28 g for easy installation and portability.
ENERGY FREE OPERATION - Venturi-powered design means zero batteries—eco-friendly and hassle-free.
PRECISION FLOW CONTROL - Delivers a consistent 3-5 gallons per minute for optimal chemical injection.
SEAMLESS COMPATIBILITY - Perfectly fits with your pressure washer setup to elevate your lawn and garden care game.

The General Pump 3-5 Gpm Chemical Injector 100775 is a compact, brass-built accessory designed to deliver a steady 5 gallons per minute flow rate using a venturi-powered system. Lightweight and battery-free, it seamlessly integrates with pressure washers to enhance chemical application efficiency for professional-grade lawn and garden maintenance.

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Manufacturer	General Pump
Part number	100775
Item Weight	0.28 g
Product Dimensions	5.59 x 2.54 x 0.25 cm; 0.28 g
Item model number	100775
Color	Black
Style	3-5 GPM
Material	Brass
Power source type	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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