Dust and water confinement unit for portable circular saw

A dust and water confinement unit for a conventional circular saw, said saw having a handle portion and a circular cutting blade, said confinement unit comprising a rigid integral housing member having a generally circular configuration for receiving and substantially enclosing said cutting blade, a base plate secured to said housing member generally at right angles thereto, pivot means on said base plate for receiving said handle portion of the circular saw at a point remote from said cutting blade whereby the saw and housing member are capable of pivotal movement relative to each other, slot means in said housing member for receiving an arbor of the circular saw and cover means for covering said slot during cutting movement of the saw, liquid fluid inlet means disposed in an end surface of said housing member located nearest said pivot means and adjacent said base plate, spring biasing means for biasing said saw into said housing member away from said base plate, and a discharge tube extending from said housing member at a point adjacent said base plate and distant from said fluid means.