Mainline Backwater Valves
Mainline backwater valves have a patented ‘normally open’ gate design. The normally open gate allows the sewer system to ‘vent’ any gases that may be causes by positive or negative pressures in the sewer line.
Showing all 13 results
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Mainline ML-4963A 4″ ABS Fullport Backwater Valve
$156.59 Add to cart -
Mainline ML-4963P 4″ Schedule 40 PVC Fullport Backwater Valve
$173.34 Add to cart -
Mainline ML9V-BW Alarm for ML-4963 Full Port Backwater valve
$151.99 Add to cart -
Mainline PA-4963LCO Replacement Lid and Cleanout for ML-4963 Full Port Back Water Valves
$43.19 Add to cart -
Mainline PA-4963KIT Full Replacement Parts kit for ML-4963 Full Port Back Water Valves
$68.00 Add to cart -
Mainline ML-4TCA 4″ ABS Fullport Top Check Backwater Valve
$167.39 Add to cart -
Mainline ML-4TCP 4″ Schedule 40 PVC Fullport Top Check Backwater Valve
$177.50 Add to cart -
Mainline ML-TCALARM Top Check Backwater Valve Alarm
$151.19 Add to cart -
Mainline ML-FR4 4″ ABS Retrofit Backwater Valve
$305.63 Add to cart -
Mainline PA-4FR FULL KIT Replacement Parts for ML-FR4 Retrofit Backwater Valve
$118.80 Add to cart -
Mainline PE2013 Access Box, 20″ L x 12.5″ W x 16″ H
$49.67 Add to cart -
Mainline ML-4XA 4″ Sch 40 ABS Adapt-a-Valve Extendable Backwater Valve
$131.99 Add to cart -
Mainline ML-4XP 4″ Sch 40 PVC Adapt-a-Valve Extendable Backwater Valve
$131.99 Add to cart