Submarine flue stop counter-valve kitchen dedicated smoke machine smoke pipe check valve anti-smoke treasure one-way smoke valve

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Color classification:: (Package 1) Kitchen check valve standard version (package 2) one kitchen one bathroom (package 3) one kitchen two-bathroom (package 4) kitchen check valve (package 5) one kitchen one-bathroom (package 5) one kitchen one-bathroom (package 6) one kitchen two-meter pipe (package 6) one kitchen two-meter pipe (package 7) Stainless steel check valve (package 8) stainless steel check valve , bathroom check valve (package 9) stainless steel check valve , bathroom check valve , 2 (package 10) stainless steel check valve , 2 meters smoke pipe (package 11) stainless steel check valve , toilet check valve , 2 meters pipe (Package 12) stainless steel check valve and toilet check valve x 2 plus 2 meters smoke pipe