The high-temperature o-ring comes standard on all stainless steel tips (M), Titanium Tips and OmniVap Condenser and Mouthpiece Assemblies. Whether you use your Vapcap a lot or you only vape occasionally, it is inevitable that some of its parts will eventually wear out. Once that happens, you can simply buy this kit of 5 spare high-temperature o-rings in order to replace the old one on your Dynavap. All o-rings are identical to the one that originally comes with the unit. They are original equipment manufacturer parts, and you can trust that they will function just the same as your Vapcap’s old o-ring.