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Without the kit, the sensor will detect excess flow but will not communicate with external devices. Installation of a drain line is recommended. An air gap is necessary when installing a drain line.\u003c\/em\u003e\u003c\/p\u003e","brand":"Water Specialties Company","offers":[{"title":"Default Title","offer_id":49796770726165,"sku":"88009411","price":61065.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0874\/6506\/6773\/files\/190757.jpg?v=1781624750"},{"product_id":"8-lf909m1-dosy-fs","title":"8 LF909M1-DOSY-FS","description":"\u003cp\u003eThis 8 inch \u003cstrong\u003eLead Free Reduced Pressure Zone (RPZ) backflow preventer assembly\u003c\/strong\u003e is designed to prevent the reverse flow of polluted water from entering the potable water supply due to backsiphonage and\/or backpressure. 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