Faucet for RO water filter system have strange sound.

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CYUE

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I have a RO water filter system. I used to have a faucet with no Air Gap Hole just connect it to the Blue 3/8" Product Water Tubing; and the "Special red "SFC" tube from RO" directly connected to the "Black 3/8" Reject tubing to drain".

Recently the faucet broke. I bought a new faucet which come with an "Air Gap Hole" on it. I connected all three tubings as instructed. Then once a while, the Air Gap Hole generating a draining/bubbling sound which is quite loud and annoying.

My question is:
Can I connect the faucet just like the one with no Air Gap Hole. This mean only the Blue 3/8" Product Water Tubing connect to faucet; and the "Special red "SFC" tube from RO" directly connected to the "Black 3/8" Reject tubing to drain". Will this give me any problem?

Hope some experts can give me some advice. Thank you. (picture attached)
 

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