IS 781:1984

In this competitive scenario, it isn't easy to survive in the market without a standard quality and certified product. BIS license may also be required to sell products in the Indian market.

To get BIS certification and produce a standard quality product, the manufacturer must ensure that their product must follow the specified Indian standard.

Let's take a closer look at IS 781:1984.

IS 781: 1984 covers cast copper alloy screw down bib taps and water service stop valves. This standard specifies the requirements for copper alloy screw down bib taps and stop valves that are suitable for cold non-shock working pressures of up to 1.0 MPa. The male inlet on bib taps must be screwed, and stop valves must have screwed female, male, or mixed ends.

The nominal sizes of bib taps and stop valves must be per standard. The nominal bore of the socket or pipe outlet to which the tap or valve is normally fitted shall be used to determine the nominal size of the bib tap and stop valves.

The materials used in the manufacture of various components of bib taps and stop valves must meet the requirements specified in the standard. The dimensions of bib tap and stop valves and their components must be in accordance with the standard. All castings must be sound and free of laps, blow holes, and pitting, and both the external and internal surfaces must be clean, smooth, and sand-free. Bib taps must be built in such a way that the water stream does not break or spread excessively.

The bib taps and stop valves must have a minimum finished mass as specified in the standard. The bib taps must always be brightly polished.


Every bib tap or stop valve complete with its components shall be tested in accordance with the method specified.

  • Dimensions and tolerances
  • Construction and workmanship
  • Finish
  • Hydrostatic pressure testing


Marking shall be done as per the requirements of IS 781:1984. Every bib taps or stop valve shall be marked with the manufacturer’s name or trade mark and nominal size on the body. The ISI mark can also be marked on bib taps and stop valves. The Manufacturer must obtain a BIS license from the Bureau of Indian Standards to use a standard mark (ISI Mark). The Bureau grants a license based on a successful assessment of manufacturing infrastructure, production process, and quality control and testing capabilities during a visit to its manufacturing premises.

isi mark


For Detailed Information about the Procedure for BIS ISI Certification


If a product falls under the scope of the BIS Conformity Assessment Scheme, All the manufacturers, importers, and foreign entities must obtain BIS ISI Certification. The Bureau may cancel the License if the product fails to meet certification requirements.

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