The product appears to be of good quality but there is no O-ring or rubber washer between the cap and the bottom of the nozzle. What is the air holding mechanism? I'm afraid it might leak. I asked the above question in the Q&A section and the seller said he has an o-ring but maybe he/she meant the o-ring between the cap and the brake fluid reservoir. ? I'm pretty sure there isn't an o-ring between the nozzle and the hard plastic cap. I'll have a look to see if it's leaking.
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