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This part of ISO 8536 applies to sterilized accessories for single use in fluid lines and pressure infusion equipment as specified in ISO 8536-8.This part of ISO 8536 includes the following:a) two-way stopcocks, three-way stopcocks, four-way stopcocks, and stopcocks manifold;NOTE Designation of a stopcock depends on the number of connections. The number of possible functional positions can be expressed by addition of a complementary note, using a diagonal stroke and a numeral indicating the number of possible stopcock positions, e.g. 3/4-way stopcock for three-way stopcock with four possible positions.b) units with injection site or check valve;c) stoppers or adapters.In some countries, the national pharmacopoeia or other national regulations are legally binding and take precedence over this part of ISO 8536.