Product Description Nutlock Valve Used to reduce or stop the flow of water down the pipe. Available In: 16mm, 20mm Materials: Body and nut PP, Grip PBT Threads: BSPT Max. working pressure: 10kg/cm2 Fertilizer resistant All 16 sizes fit also 17 sizes Wall thickness: 16-17mm: 0.7 1.5mm, 20mm: 0.9 2.0mm, 25mm: 1.4 2.0mm