Inside diameter hose length??? I'm not sure I know how to measure that? If you want the inside diameter just measure what you have, or take a piece with you to the hardware store and match a hose that way. My time with the G3 was extremely short, the G3, well, it wasn't a popular filter and didn't catch on. But their FX line are my favorite canister filters. Good Luck, sorry I couldn't help you more.
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