4" Bottom Drain Kits

4 inch bottom drain kit options like this EasyPro drain kit help create a clean, reliable path for debris removal from the pond floor while supporting a watertight liner connection.

Built around a heavy-duty, roto-molded base, this kit is designed for long-term strength and secure installation. A threaded center stand pipe attaches the dome lid firmly to the base, helping the dome stay stable in operation. The liner ring is fastened with sixteen stainless screws to help create a tight seal through the liner and reduce the risk of leaks at the drain connection point.

Designed for 4" Schedule 40 PVC Connections

This drain is intended for use with 4" schedule 40 PVC fittings and pipe. To connect to 4" pipe, use a 4" male adapter (MA40). To connect to 3" pipe, use a reducing male adapter (RMA4030). These common plumbing options make it easier to plan a layout that matches your pond and filtration design.

Drain Kit Includes Key Hardware

• Bottom drain assembly
• 4" bulkhead fitting
• 4" valve and fittings
• Note: Flex pipe is sold separately

Because a 4 inch bottom drain kit is often plumbed to a skimmer box or filtration intake, having the primary valve and fittings included can streamline installation planning and maintenance access.

Air Diffuser Option (EBD4A)

The EBD4A version incorporates an air diffuser in the dome lid. Incoming air is delivered up through the center stand pipe, allowing air tubing to be installed under the liner for a cleaner finished look. The tubing adapter is 1/2", and recommended airflow through the diffuser is 0.5–1.5 cfm.

FAQ

Will this work with 3" plumbing? Yes—use the reducing male adapter (RMA4030) to transition to 3" pipe.

What’s the main benefit of choosing a 4 inch bottom drain kit? A properly sized drain and secure liner seal help support efficient pond-floor debris transport and dependable leak resistance when installed correctly.

Do I need extra parts? Typical installs may require pipe, adapters, and flex pipe (sold separately), plus any filtration components used downstream.

Choose this 4 inch bottom drain kit when you want a robust roto-molded design, a screw-secured liner ring, and a plumbing-friendly layout for 4" Schedule 40 systems.