Oil sealed technology is our company first generation.We are now adopt to the third generation urinal,it is applied on the mechanical principle with high sensitivity,airproof baffle can open and close under the draught head outside and inside and its own gravity when urine runs through the waterless trap. The airproof baffle makes good leak tightness by its own gravity. So the odor of pipe line was cut off absolutely.It has acquired five national patents for its technology