Screwthread Adaptor Thread 13 CS1423 Qfit-(ELS-QST51130) offers a thoughtfully designed, durable resource for hands-on learning. Screwthread Adaptor Thread 13 CS1423 Quickfit - Use these adapters with a ground cone and screwthread connection to connect thermometers and inlet tubes to your Quickfit® assemblies. With screwthread joint complete with plastic cap, silicone rubber ring and PTFE washer Ideal for securing thermometers, gas inlet tubes, etc.