![Double 18 Pin Sub-C Feedthroughs on a 2.75" Flange Double 18 Pin Sub-C Feedthroughs on a 2.75" Flange](https://api.swarm.accuglassproducts.com/sites/default/files/styles/product_display/public/100012_001_8.jpg?itok=7oP_CfzA)
9C2-275, 18-Pin Feedthrough on a 2.75" CF Flange.
18-Pin (Two 9-Pin), Sub-C Feedthroughs on a 2.75" CF Flange.
This is also known as a Dual or Double 9-Pin, Circular 9 Pin Feedthroughs.
See below under "Specifications" for performance and construction material.