Crimp Cap With Septa
There are two types of 20mm septa produced by Aijiren. They are made of silicone and PTFE. There are many colors, white, natural, white and blue, natural and yellow, natural and blue, and the style is two flat septa. Compound together. The other is a composite of PTFE and Butyl. Butyl has a harder material and is similar in color to PTFE, so a central hole pattern is made to distinguish the front and back sides.