7. The size of the connection from the Allegro hood hose.....I have no idea. That is what is the size basis for the other parts.
New Line Hose and Fittings for Industrial, Plumbing, Commercial and Retail applications.
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I believe the connection from the Allegro connection is a High Flow type....but I am unsure....I dont have one to hold & inspect.
You need to find out what type and size it is. Then the rest will be sized to fit it.
It looks like it could be a 1/4" or 3/8" from the photos.
View attachment 161802
6. The coupler will be based on the size of the quick connect fitting from above.
5. There are a variety of barb sizes.....but it will have to fit whatever coupler you get, which in turn is based on 7.
There are usually all sorts of combinations that you can find. You can find one, just keep looking.
The part Im concerned about is the quick connection fitting from the Allegro hood hose.....it could be 1/4 or 3/8...just not sure.
But once you get that size,,,,the rest of the parts can fall into place.
It might take some trial and error to get all the correct parts to work together.
If you find out what size it is, let me know. I can put that data in my guide.