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A paintbrush usually 4 to 6 in. (10 to 15 cm) in width, with long, stiff bristles, usually made of

A joint between two conduits, ducts, or pipes that permits one of them to be deflected or moved without significantly

Round flexible ducts in an air-conditioning system used to reduce the transmission of vibration along the ductwork; used in place

In an air-conditioning system, a short length of flexible non-porous material that is inserted between metal ductwork and a metal

A coupling, used in rotating machinery, having high transverse or torsional compliance.