Septa for 8mm Screw-Thread Vials, Restek. Supplier: RESTEK CORP. 21795 21178 21179 21147. 10058-694PK 27.44 USD. 10058-694 RK21178 10854-034 10854-008. Septa for 8mm Screw-Thread Vials, Restek. Septa. Septa for Restek screw caps are available for use with vials with 8-millimeter-wide openings. Screw-thread vial compatibility.