Submarine check valve flue stop valve range hood kitchen special universal reverse check valve exhaust pipe smoke prevention treasure

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Color classification:: Kitchen counter-check valve (ABS engineering plastic) Toilet counter-check valve 1 kitchen counter-check valve (ABS engineering plastic) +1 bathroom counter-check valve 1 kitchen counter-check valve (ABS engineering plastic) + 2 bathroom counter-check valves Kitchen counter-check valve (classic stainless steel) with nail-free glue Classic stainless steel kitchen counter-check valve +1 plastic toilet Upgraded counter-check valve +1 flue pipe Kitchen counter-check valve (stainless steel new fire-fighting model) Kitchen counter-check valve (stainless steel new fire-fighting model) +1 bathroom counter-check valve Kitchen counter-check valve (stainless steel new fire-fighting model)+ 2 bathroom counter valve Kitchen smoke pipe diameter 160MM length 1.5 meters Kitchen smoke pipe diameter 160MM length 2 meters