The purpose of a wave guide cover is to shield the opening through which the microwaves enter the main cavity. SHARP Microwave Oven Waveguide Board ( 117mm x 65mm). R222STM, R272(K)M, R272(SL)M, R272(W)M, R274(SL)M, R274(W)M, R622STM, R662(K)M, R662(SL)M, R662(W)M.
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