The invention relates to a tapping stop valve consisting of plastic. Said tapping stop valve has a main connection piece (11) which has a metallic guide bush (21) on its inner surface (18) for a boring tool (30) which can be rotary-actuated therein. A branch connection piece (12) also opens into the inside of the bush though a side opening in the guide bush. The guide bush is integrated into the plastic material of the main connection piece. The aim of the invention is to provide a reliable tapping stop valve which is able to resist high stresses. To this end, the guide bush and a connection bush (46, 47) form a single construction unit and is situated at the side opening of the guide bush. The connection bush is integrated into the plastic material of the branch connection piece at least in some areas, receiving the flow of media from the guide bush after boring and then transferring it elsewhere.
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