Will this work for 1.6 gallon aquarium ?

Would be much to big. We used it for a 30 gallon.

im looking at the medium or large how big is the hose?

I have the large size. It works well for a 55 gallon tank. The suction tube is 24" long, the hose is 6' long and it has a 1/2" diameter. It fills a 5 gallon bucket pretty quick. I wouldn't get a medium size for a 55 gallon tank, the suction tube would be too short. I had this product for a while and I am happy with it.

what is the ID & OD of the 6-foot tube?

The ID is 7/16", OD 9/16". Be advised that the end of the tubing is soft and doesn't hold a perfectly round shape. I measured it a few times and came up with the same results though. If you are trying to fit the inside of the tube over a 1/2" OD coupling, it may work with some lubrication and perhaps heating it first in hot water.

ASIN	B0002AQI6I
Allergen Information	Allergen-Free
Brand	Marina
Brand Name	Marina
Contains Liquid Contents?	No
Country of Origin	USA
Customer Reviews	4.2 out of 5 stars 2,610 Reviews
Global Trade Identification Number	00015561110600
Item Form	tube
Item Weight	0.14 Kilograms
Manufacturer	Hagen
Material Feature	Unscented
Material Features	Unscented
Net Quantity	1.0 Count
Number of Items	1
Scent	Unscented
Special Features	Lightweight, Portable
Specific Uses For Product	Active.
UPC	015561110600
Unit Count	1.0 Count

Marina Easy Clean Gravel Cleaner, Mini

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