Sizes available are for pipe bore sizes: Pipestoppers Nylon Pipe Plugs are suitable for a myriad of applications. They are mostly used for weld testing, leak testing of pipework fabrications, weld purging or simply stopping to prevent the ingress of dirt, rodents and other unwanted material. However there are over 100 different applications for these plugs.These plugs are constructed from injection moulded nylon components and rubber rings. They have the advantages of being light, non rusting easy to expand and can be dismantled for cleaning purposes.The grade of nylon chosen is pure nylon 6 which has considerable wear characteristics and makes them stronger and more robust than other plastic plugs.These plugs will provide airtight seals and in tests with plastic pipes are capable of sealing against pressures from 60 psi - 4 bar, to over 100 psi - 7 bar.Effective sealing is simple, insert the plug into a pipe opening and tighten the wing nut clockwise. The rubber ring will expand and provide a positive seal. To remove simply reverse the process. Pressure Rating > Nominal I.D. Range psi Bar 1 / " 12 - 16 mm 100-150* 7-10* They are in normal usage for plumbing operations in a wide variety of industries, including domestic and industrial water and drainage systems. Also for ducting and conduit, plastic pipe bending, swimming pools, masking in painting and casting industries and many others. > 2 3 / > 4 " 18 - 24 mm 150* 10*1" 23 - 32 mm 130* 9*1 Applications > 1 / > 4 " 31 - 42 mm 70* 5*1 > 1 / > 2 " 37 - 54 mm 60* 4* > With 10mm BSP threaded waterway: > Nominal I.D. Range psi Bar 1 / > 2 " 12 - 16 mm 100-150* 7-10* > 3 / > 4 " 18 - 24 mm 150* 10*1" 23 - 32 mm 130* 9*1 > 1 / > 4 " 31 - 42 mm 70* 5*1 > 1 / > 2 " 37 - 54 mm 60* 4* With > 1 / > 2 ٔ BSP threaded waterway: Pressure Rating > Nominal I.D. Range psi Bar 2" 48 - 65 mm 18 - 50* 1.2 -3.4*2 > 1 / > 2 " 60 - 77 mm 34.5* 2.3*3" 70 - 87 mm 15* 1.0*3.5" 83 - 97 mm - -4" 95 - 110 mm 15* 1.0*4.5" 114 - 130 mm - -5" 121 - 142 mm 12* 0.8*6" 148 - 162 mm 10* 0.6* > *= results depend upon exact ID of the tube/pipe, number of turns, condition of the inside of the pipe and the material. * Pressure tests were carried out at 18 degrees Centigrade. As working temperature is increased, it can be expected that pressure ratings must be reduced. size="-2">