역류 가능이 있다면 역류방지 밸프를 설치하시면 되요.
https://smartstore.naver.com/bgc0711/products/9992303967?n_media=27758&n_query=%EC%97%AD%EB%A5%98%EB%B0%A9%EC%A7%80%EB%B0%B8%EB%B8%8C&n_rank=2&n_ad_group=grp-a001-02-000000044651793&n_ad=nad-a001-02-000000319030518&n_campaign_type=2&n_mall_id=ncp_1or6zm_01&n_mall_pid=9992303967&n_ad_group_type=2&n_match=3&NaPm=ct%3Dm8nojjy6%7Cci%3DER24732e8f%2D0905%2D11f0%2D9581%2Da0369ffb3b68%7Ctr%3Dpla%7Chk%3De7c0bddc70a0e2248915d459a14b182061ae5acc%7Cnacn%3Dv7s5Bgw3AJQP
2. 무슨 말씀인지 이해가 안되네요.
