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 efficiency, skip the fuss!

COMPACT LIGHTWEIGHT - Slim 5.59 x 2.54 cm footprint fits seamlessly into your setup
DUAL PORT CONNECTIVITY - Two ports for versatile, easy integration with your equipment
EFFORTLESS POWER SOURCE - Venturi-powered design means zero batteries, zero hassle
RUGGED BRASS CONSTRUCTION - Engineered for long-lasting durability and corrosion resistance
PRECISION CHEMICAL INJECTION - Delivers consistent 3-5 gallons per minute for flawless application

The General Pump 3-5 Gpm Chemical Injector 100775 is a compact, brass-bodied injector designed for precise chemical delivery in pressure washer setups. Powered by a venturi system, it operates without batteries, ensuring reliable, maintenance-free performance. Its dual ports and robust construction make it an essential upgrade for professionals seeking efficiency and durability in lawn and garden chemical applications.

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Brand	General Pump
Manufacturer	General Pump
Model number	100775
Colour	Gold
Number of Memory Sticks	1
Item Weight	0.28 g
Product Dimensions	5.59 x 2.54 x 0.25 cm; 0.28 g
Item model number	100775
Item Height	0.25 Centimeters
Item Width	2.54 Centimeters
Number of Ports/Connectors	2
Power Source	Venturi
Included Components	Brass Chemical Injector Body Only
Are batteries included?	No

General Pump 3-5 Gpm Chemical Injector 100775

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