MAINLINE ML-FR4 Backwater FIO Valve, 1/2 in, Lead-Free

The newly reintroduced ML-FR4 ABS automatic backwater valve is a great choice for retrofit situations where you have a limited amount of slope to work with.

MAINLINE Backwater FIO Valve, 1/2 in Nominal, ABS Body, Lead-Free/Contains Lead: Lead-Free, Dimensions: 4 in OD

• This is a normally open design, automatic backwater valve that permits the free circulation of air throughout the plumbing system, allowing gases to move just as if the valve wasn't even there
• The valve will close automatically when sewage back-up occurs, reducing the risk of sewage backflow throughout the dwelling
• The ML-FR4 is designed to be installed in building main lines to prevent back-up through floor drain, shower drain, toilet and sink drain
• It closes automatically when the municipal sewer line or septic system starts to back-up or a reverse flow occurs
• The clear plastic lid allow for easy visual inspection and accessibility for cleaning

• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/MAINLINE_ML_FR4_Specification_Sheet.pdf
• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/MAINLINE_ML_FR4_Specification_Sheet.pdf