reg 20.1
In forceThe interior of the pipework or hose leading to the system and between the system and the flush and pump out fittings must—
20.1 The interior of the pipework or hose leading to the system and between the system and the flush and pump out fittings must—
(a)
be as smooth as practicable, to allow the free flow of greywater; and
(b)
have a nominal diameter of not less than 40 millimetres.
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