3" Sewer Relief Valve DESIGNED FOR USE IN OUTSIDE CLEANOUTS TO ELIMINATE COSTLY DAMAGE DUE TO SEWAGE BACK-UP. FITS 3″ CAST IRON OR PLASTIC PIPES. PROVIDES A VISIBLE WARNING THAT SEWAGE IS BACKING UP...
4" Sewer Relief Valve DESIGNED FOR USE IN OUTSIDE CLEANOUTS TO ELIMINATE COSTLY DAMAGE DUE TO SEWAGE BACK-UP. FITS 4" CAST IRON OR PLASTIC PIPES. PROVIDES A VISIBLE WARNING THAT SEWAGE IS BACKING UP...