Section 27(1) in Haryana Municipal Drainage and Sanitation Bye-laws, 1977
(1)Every water closet pan composition of which should be as per specifications laid down by Indian Standard Institute, shall have an efficient syphon trap with a minimum water seal of 75 mm beneath so that sufficient water seal, between the pan and any drain or soil pipe, is maintained. D trap shall not be fixed in connection with the water [closet] [Substituted for the words 'closets' by Haryana Notification No. S.O. 120/H.A. 24/1973/Sections 200 and 214/2007. dated 11.12.2007.].
