2, air sac trachea connector is not neat, resulting in according to the marking inserted into the bit after the existence of gas leakage problems;<br>3, A1331 manufacturer valve body plug tracheal difficulties, normal force plug can not be inserted into the bit at once (see video attachment);<br>4, the current two suppliers before the suspension air sac control valve structure is different, can be inserted depth difference of about 10mm.
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