The present invention relates to a perspective type suction diffuser installed in an inlet of a pump to stably induce a flow of a fluid and reduce a flow velocity of the fluid to protect the impeller and to remove foreign matter. Since the conventional suction diffuser does not have means for inspecting the interior, it is difficult to grasp the flow rate and flow rate of the fluid from the outside, and it is impossible to visually grasp the degree of corrosion of the interior or the influx of impurities. In order to solve this problem, there is a suction side connection part for introducing a fluid into one side of the body, and a suction side connection part for introducing fluid into the other side A suction port connected to the suction port, and a discharge port connected to the discharge port; and a blowing means for blowing the fluid from the outside to the body, wherein the blowing means includes an opening formed at one side of the body; A viewing member provided on the outside of the opening to guide the inside thereof; A fixing member coupled to the opening and having a penetrating hole formed therethrough so that the penetrating member can be viewed from the outside through the penetrating member and the safety cap having a tool engaging projection on an outer surface thereof is detachably coupled to the penetrating hole; And a fastening member coupled to the inside of the fixing member to fix the transparent member. Therefore, the present invention can visually grasp the flow rate or flow rate of fluid, the degree of corrosion of the interior or the inflow of impurities from the outside without disassembling the components, and can immediately take measures to minimize the occurrence of failures and extend the service life. Maintenance and repair are easy and convenient, and the maintenance cost is reduced.
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