The bottle syringe plugs have threads that form a leak-free seal with the bottle ensuring no liquid is wasted, even when the bottle is tipped upside down. You’ll get the perfect dosage every time. Use these bottle adapters with Brandzig 1ml, 3ml, 5ml, and 10ml oral syringes (Check our storefront for availability.) Press in the medication syringe into the hole at the top of the plug until you feel it stop and form a tight seal.