Kiki,
If yu are using 1/2 fittings, you can use
7/16 ID 5/8 OD
7/16 ID 11/16 OD
1/2 ID X 5/8 OD
1/2 ID 3/4 OD
Tygon 3603 is very flexible and long lasting. Won't kink like vynle hose will. 7/16 gives you a real tight fitting on your fittings, but the 3/4 gives you greater preasure handling, which you really don't need. If you're going to use compression fittings, make sure they are for the size tubing you get
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