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"Attach the needle to the tube. Take the cap off the end of the tube, then remove the cap from the bottom of the needle. The two ends you just uncapped will fit together—give them a twist to attach them securely.\nDon't touch the end of the tube before you attach the needle—this should also remain sterile."
<https://www.wikihow.pet/Nurse-a-Dog-Through-Parvo>