Abstract: A testing device for backflow prevention devices, the testing device comprising a first connection portion adapted for connection to one of a high pressure side or a low pressure side of a backflow prevention device, a second connection portion adapted for connection to the other of the high pressure side or the low pressure side of the backflow pressure device, and an electronic differential pressure gauge positioned in fluid communication with the first connection portion and the second connection portion and adapted to measure the differential pressure between the high pressure side and the low pressure side of the backflow prevention device.

Abstract: In a method of replacing a section of an old cast iron main with a new main of plastics pipe material, the section to be replaced is isolated from the adjacent live main after a by-pass is fitted between the section and the main. One end of the pipe is then pushed up the isolated section until a desired length is located within the isolated section and the other end of the pipe is connected to the end of the adjacent main. This enables the isolated section to be kept alive solely by gas flow through the pipe from the main and the by-pass can therefore be removed.

Abstract: A clip device made up of two separable members, each member having on it a jaw portion, the members being pivotable relative to each other, one of the said members having on it a length of acetal or other suitable plastic material supported only by its ends and adapted to form a torsion bar, the other member being attached to the first in such a manner that the torsion bar portion is preloaded to bring the jaw portions into contact, one or both being provided with a portion to which finger pressure may be applied to separate the jaws against the torque of the torsion member.