An air entrainment spa nozzle having a jet of water which passes over an air entrainment port with the air entrainment port having a downstream structure which enhances the air entrainment. In one embodiment, the air enhancement structure is a ramp which extends in a downstream direction from the air...http://www.google.ca/patents/US6575386?utm_source=gb-gplus-sharePatent US6575386 - Spa nozzles with air entrainment
