Fitting to replace air gap with high loop

[FBRB32]

I want to replace my air gap with a high loop. I have a 5/8" ID rubber hose coming from the dishwasher to the air gap, and a 7/8" ID rubber hose from the air gap to the disposal. I thought it would be super quick and easy to simply replace the air gap with a barbed reducer coupling that is 5/8" on one side and 7/8" on the other. Unfortunately, that coupling does not seem to exist anywhere I have looked. Am I missing something? I feel like it should exist.

Thanks for any help!

 

[Fitter30]

The fitting on the disposal body that has a knockout is for the dish washer . That hose has to be looped higher than the disposal look into install manual for dishwasher. Or could use ell and street ell.

Charlotte Pipe Schedule 40 2 in. Hub X 2 in. D Hub PVC U-Bend 1 pk Mfr# PVC007000800 - Ace Hardware

PVC DWV fittings are for drain, waste and vent purposes. They are used in gravity-fed waste elimination systems and are for Non-Pressure systems where temperatures will not exceed 140° F. PVC is lightweight and easy to install. They require no special tools for cutting, and be installed with...

www.acehardware.com

 

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[FBRB32]

Thanks. So, I already have a rubber tube hooked up to the disposal, and I understand the high loop requirement. I currently have it plumbed through an air gap, which I want to remove.

I guess my question, simply stated, is this: What is the best/easiest way to connect a 5/8" ID rubber drain hose to a 7/8" ID rubber drain hose?

 

[FBRB32]

Any thoughts on this?
What is the best/easiest way to connect a 5/8" ID rubber drain hose to a 7/8" ID rubber drain hose?