The cap fits all GL 45 borosilicate 3.3 glass bottles. The cap has four holes suitable for 3.2 mm tubing. The holes can be sealed using a silicone seal if not required. Cat. No. Description Pack Unit 11 298 12 Screw cap HPLC, GL 45, 4 ports, complete (GL 45 screw cap, 4 x M8 black screw caps, 12 x silicone seals for 1.6, 3.2 mm tubing or blanks) 2