Various adaptors are used for securing a replaceable syringe tip in operative relationship to a handpiece body. The syringe tip is mounted on a tapered male connector set in the hollow interior of the adaptor. O ring seals and a metal flange member are used to prevent the leakage of air or water passing...http://www.google.com.au/patents/US5192206?utm_source=gb-gplus-sharePatent US5192206 - Dental syringe tip and adaptor
