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The coupling nut is used with certain BSP fittings and with a Nutlock barbed insert. The pipe is pushed on to the barbed insert and then the coupling nut is pulled over the fitting and tightened so that the LDPE pipe is compressed between the barb and the nut making this a very secure fittings
Suitable for 16mm Outside diameter LDPE pipe
Use with the coupling nut insert
Use on the soil surface or just below the surface. Do not use if the pipe is being buried below the surface