What connector size should I specify when sourcing snow foam cannons for commercial pressure washers?

What connector size should I choose for wholesale snow foam cannons to fit most pressure washer brands?

How do I choose between a 1/4 inch quick connector and a M22 fitting for importing bulk snow foam cannons?

How can we request a small sample of the concentrated spray cleaner formula to run compatibility tests?

How do I choose the right wall thickness for stainless steel tubes used in high-pressure hydraulic systems?