a contrivance to let air and condensed water out of steam pipes and radiators with little escape of steam. Advertisements
a brownish orange clay used in the production of vitrified clay pipe
a halogen element isolated as a heavy greenish yellow irritating gas of pungent odor used especially as a bleach, oxidating agent and disinfectant in water purification. Usually made by electrolysis of aqueous solutions of sodium chloride.
rope, usually asbestos, which is wrapped around a pipe at a joint to retain the molten lead when it is poured into the caulked joint.
a screw thread in which the driving face is made perpendicular to the axis of the screw (as in a square thread) while the back face makes an angle with the axis (as in a V thread) in order to combine efficiency in the transmission of power with strength.
a device installed in a drain or pit or in the pipe to prevent drainage from backing into a low level. Usually used where combination sewers exist.
a device installed in sewer systems to prevent backflow. Acts as dam obstruction in pipe to water flooding backwards.