SEAL UP THIS SPRING. Get your ducts sealed with our patented Aeroseal technology! Black Diamond Plumbing Sewer Electric. HVAC There when you need us of $30 OFF ANY SERVICE CALL Offer valid for services over $100. Cannot be combined with any other offer. Coupon must be presented at time of service. Cannot be used towards backflow testing, maintenance agreements, previous services, diagnostic trip fee or afterhours/holiday fee Expires 4/15/23 NW0323 $200 OFF DUCT CLEAN & SEAL COMBO Cannot be combined with any other offer. Coupon must be presented at time of service. Cannot be used towards backflow testing, maintenance agreements, previous services, diagnostic trip fee or afterhours/holiday fee Expires 4/15/23 NW0323 License # 058-140555 SEAL UP THIS SPRING . Get your ducts sealed with our patented Aeroseal technology ! Black Diamond Plumbing Sewer Electric . HVAC There when you need us of $ 30 OFF ANY SERVICE CALL Offer valid for services over $ 100 . Cannot be combined with any other offer . Coupon must be presented at time of service . Cannot be used towards backflow testing , maintenance agreements , previous services , diagnostic trip fee or afterhours / holiday fee Expires 4/15/23 NW0323 $ 200 OFF DUCT CLEAN & SEAL COMBO Cannot be combined with any other offer . Coupon must be presented at time of service . Cannot be used towards backflow testing , maintenance agreements , previous services , diagnostic trip fee or afterhours / holiday fee Expires 4/15/23 NW0323 License # 058-140555