MDPE - Medium density polyethylene, Minimum depth - 750mm, Maximum depth - 1350mm, Water undertaker - Welsh water, Underground water - Well / artesian well / water spring , Surface water - Ocean / river / pond / lake , Tank in loft space - Cold water storage cistern, Supply of water from cold water cistern  - Indirect cold water supply, Max amount of MDPE pipe on show - 150mm, Fluid category one - Wholesome water, Fluid category two - Change in temperature or a visual change , Fluid category three - Slight heath hazard, Fluid category four - Significant health hazard, Fluid category five - Serious health hazard, AUK2 - bathroom basin, AUK3 - Kitchen sink , Backflow prevention - Air gap or check valve , Drain off position - Every low point ,

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