For pressure testing and stopping all pipework from 75mm (3) upwards. To complete the Pipestoppersԙ range of nylon expanding plugs we offer all sizes of aluminium plugs. These are provided in sizes from 3, for more arduous duties such as long immersion in water and higher temperature. They are manufactured with > 1 / > 2 Ԕ, 1, 2Ԕ outlets as shown in the chart overleaf.The standard seals are made from natural rubber and special rubber seals are available for chemical applications where greater resistance is required.All plugs conform to British Standards BS 8005 for low pressure testing and sealing of pipes. >