Lock & Seal feature allows quick bottle attachment and removal from dental unit. Easy quick connect feature saves time & money: • No cross threading. • Extends life span of bottle. • Eliminates screwing bottle onto dental unit. • Prevent wear and tear on dental unit manifold. Easy to install on dental unit, no tools required. Designed to retrofit into an existing water bottle system with standard 28mm bottle threads. Also universally fits dental unit water purification cartridges.