The PTFE caps are an essential component of the Carousel system. Manufactured from chemical-resistant PTFE, the caps are attached to the reflux neck using a 1/4 turn quick-thread and feature an Easy-On push connection to the radial gas system. The 015862520caps feature a silicone septa and an on/off valve for isolation and removal from the inert gas system. The 015862530 storage cap features the quick-thread and septa but without the sidearm or valve. Caps feature a replacement nitrile O-ring with a Viton option available.