Water taps: Watertightness under operational conditions (NT VVS 028) Posted onFebruary 25, 1985September 25, 2020Author Report #: NT VVS 028 Approved: February 1985 Download pdf Size: 43.35 KB Abstract This method specifies a test for checking the watertightness of water taps after the taps have been subjected to a mechanical endurance test on the manoeuvering mechanism. Categories