Abstract: An apparatus for cleaing underwater surfaces including at least one rotatable brush and pump for producing a stream of water from the front to the rear thereof. The brush and pump are axially reciprocable in a housing. The brush has bundles of bristles, each bundle having a head portion fitted into notches at the periphery of a main ring and held therein by a pinch ring, the main and pinch rings together constituting a brush base which is detachably secured to a rotatable base associated with the pump, by means of a pair of fixed members which are engagable upon relative rotation of the rotatable base and brush base.

Abstract: Apparatus for cleaning underwater surfaces and including at least one rotatable brush, and at least one pump the generating a stream of water passing from the front to the rear of the brush to hold the apparatus against an object to be cleaned. The apparatus can be readily manipulated and held in any desired attitude as a result of the brush being surrounded by an annular tube containing two immiscible materials of different specific gravity, such as a solid and a liquid, or two immiscible liquids.