Connect needle to syringe and twist to safe. To assure appropriate needle attachment, use the needles presented or 30-gauge needles with identical needle guards. Completely seat hub of needle in syringe. Don't about tighten, as this may crack the needle and/or dislodge the syringe.Nh? v?i b?t k? ?i?u tr? nào t?i m?t nào, n?u x?y ra nhìn m? thoá