BS 5412:1996 Specification for low-resistance single taps and combination tap assemblies (nominal size 1/2 and 3/4) suitable for operation at PN 10 max - and a minimum flow pressure of 0.01 MPa (0.1 bar)
The standard specifies the dimensional, watertightness, pressure resistance, hydraulic, mechanical strength and endurance characteristics with which size 1/2 and 3/4 single taps and combination taps shall comply.
BS 5412:1996 history
2009BS EN 200:2008 Sanitary tapware - Single taps and combination taps for water supply systems of type 1 and type 2. General technical specification
1996BS 5412:1996 Specification for low-resistance single taps and combination tap assemblies (nominal size 1/2 and 3/4) suitable for operation at PN 10 max - and a minimum flow pressure of 0.01 MPa (0.1 bar)