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If the Eheim diffuser came with a check valve, throw it out. It actuates at about 15 psi. A tetra check valve available from Petsmart actuates at about zero psi.

Try blowing into the diffuser without the check valve. If the resistance is too great because of that narrow tubing and nipple, I can trade you for my diffuser. I replaced the narrow nipple with a wider one that accepts regular airline tubing. The resistance should be less. otherwize we need to devise a way to feed the co2 directly into the intake of your 2217.

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