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Figure 13.6
A comparison between the
prototype WC and British
Standard designs. All
length measurements are
in millimetres |
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| Description | BS 5503: pt 2 | Twyfords
BS 1213
p-trap WC
pan Mark o | Mark III
WC | Depth of water
seal h | 50 min. | 56 | 36 | Clearance below
tip of plate R | 75 min. | 77 | 69 | | Trap seal volume | n/a | 1.79 L | 0.86 L | | Water surface: | | | | | back to front E | 150 min. | 165 | 118 | | side to side G | 110 min. | 113 | 79 | | Height A | 390 + 10 | 406 | 390 | Distance from
tip of back plate
to inside face of
flush rim B | 70 max. | 30 | 32 | Width of
opening M | 240 max. | 260 | 275 | Length of
opening L | 290 max. | 320 | 320 | Width of
opening N | 360 + 10 | 355 | 350 | Height to
centre of
WC outlet K | 190 | 191 | 190 |
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