1/2/5 ชิ้น สวิตช์สัญญาณแบบพาสซีฟชนิด 6 จุด พร้อมฟันเกลียวภายในแบบเคลื่อนย้ายได้ สำหรับระบบท่อส่งน้ำ/ลม/ไฟ

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