Features a precision-machined Teflon plunger tip which, when wetted, forms an interference fit with the inner diameter of the glass barrel, achieving the seal required for accurate operation. Seal must be wetted before filling. The glass and Teflon construction provides an inert flow path for the most demanding applications. Luer Lock hubs for 25, 50 and 100 mL syringes are Kel-F instead of Teflon.