|Fluid Category 4 - Size||DN20|
|Fluid Category 4 - Powered||No|
|Fluid Category 4 - Requires Annual Testing||No|
The main application identified in the Water Regulations Guide is for porous hose ﾓleakyﾔ irrigation in a house garden. Water companies may accept small non-house porous hose applications in non-house situations.
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Every Hose Union Tap shall be fitted with a DB Pipe Interrupter, suitable for fluid category 4 backsiphonage protection – model DB20M256 - as distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The device shall be fitted vertically and at least 300 mm above the spillover level. No valves must be fitted downstream of the device. The body of the valve shall be chrome plated brass with DN20 male inlet and outlet.