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kPa: A metric unit for pressure. 100 kPa = one atmosphere. KW: Kilowatt. A measure of the rate of supply of energy or power, equal to 100 watts or 3412 BTU's per hour. Kafer Fitting: Cast iron drainage pipe fitting with threaded-on hub used to attach to existing cast iron line. Knockout Plug: PVC test plug. Kollar Kap: Styrofoam forms used to protect floor drains while concrete is being poured around them.