They are poorly made. If your pump is designed to work with these needles, prepare to ruin the needle by taking it out. Any force pulling or shaking the needle will break. See first picture. I used them three times and they broke three times. In addition, their finish also leaves something to be desired, making it difficult for whatever you pump in to penetrate. And yes, I lubricated the needle before inserting it. Notice the uneven end in the second photo. Save yourself the hassle and spend twice as much money for half the needles.
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