4" Heavy Duty Bottom Drain without Diffuser

This heavy duty bottom drain is very reliable and available with or without an air diffuser! Features include: Welded FPT threaded inlet eliminates the need for rubber coupling Threaded center stand pipe securely attaches dome lid to base Sixteen stainless screws securely attach liner ring to base with water tight seal Heavy duty, roto-molded design offers superior strength For use with 4" schedule 40 PVC fittings and pipe, use 4" male adapter (MA40) to connect to 4" pipe, or use standard PVC Reducing fittings to connect to 3" pipe EBD4A incorporates an air diffuser into the dome lid - incoming air is delivered up through the center stand pipe allowing air tubing to be installed under liner EBD4A tubing adapter is 1/2", recommended air flow through diffuser is .5 - 1.5 cfm