THIS VERSION OF THE ENVIROSAFE CATCH BASIN, THE PUMP DRAIN CATCH BASIN, IS USED IN NEW CONSTRUCTION OR WHEN REPLACING AN EXISTING PUMP HUB DRAIN.  THE PUMP DRAIN CATCH BASIN'S DESIGN IS BASED ON THE LINE SIZE TO GIVE FULL FLOW.  THE PUMP DRAIN CATCH BASIN PROVIDES CONTINUOUS FLOW WHILE MAINTAINING A WATER SEAL THAT PREVENTS HYDROCARBONS FROM ESCAPING TO THE ATMOSPHERE, THEREBY COMPLYING WITH EPA AIR QUALITY REGULATIONS RESTRICTING EMISSIONS OF VOC'S SUCH AS BENZENE.  DRAIN LINES SHOULD BE PIPED INTO THE PUMP DRAIN CATCH BASIN SO AS TO ALLOW FOR REMOVAL OF THE CAP FOR FLUSHING TO REMOVE ANY HYDROCARBONS FLOATING ON THE WATER SEAL.  A MINIMUM WATER SEAL DEPTH OF 6" IS RECOMMENDED TO PREVENT BACK PRESSURE FROM FORCING ANY HYDROCARBON VAPORS THROUGH THE WATER SEAL ONCE THE SEWER SYSTEM HAS BEEN SEALED.  THE PUMP DRAIN CATCH BASIN CAN PREVENT SEWER EXPLOSIONS BY ELIMINATING CONTACT OF SEWER GASES WITH AN IGNITION SOURCE.

COVERED BY U.S. PATENT NO.'S    4,682,907;    4,776,722;     5,028,320;    5,062,735