Product Overview

The Hayward DEX2420MAR2 Manual Air Relief Assembly is a genuine Hayward replacement part designed to help safely release trapped air from compatible pool filter systems. Installed at the top of select Hayward DE and cartridge filters, this assembly allows the filter tank to be manually vented during startup, servicing, and normal maintenance.

By helping remove built-up air from the filter, the DEX2420MAR2 supports proper circulation, consistent filtration performance, and safer pressure management. It is commonly used with Hayward Pro-Grid DE filters and SwimClear cartridge filters as a replacement for older manual air relief assemblies.

Ideal For

This Hayward manual air relief assembly is ideal for pool owners or service professionals replacing a worn, leaking, cracked, or non-functioning air relief valve assembly on a compatible Hayward filter.

Best suited for:

• Hayward Pro-Grid vertical grid DE filters
• Hayward SwimClear cartridge filters
• Compatible Hayward DE and cartridge filter systems
• Replacing older DEX2420MAR-style assemblies
• Restoring proper manual air venting at the filter
• Pool service repairs and filter maintenance

Key Features

Genuine Hayward Replacement Part

The DEX2420MAR2 is an original Hayward replacement assembly, built to match the fit and function required for compatible Hayward filter systems. Using a genuine part helps maintain proper sealing, pressure relief operation, and filter performance.

Manual Air Relief Function

This assembly allows users to manually release trapped air from the filter tank, helping the system prime properly and reducing air accumulation inside the filter during operation.

Helps Support Proper Filter Pressure

Trapped air inside a filter can affect water flow and pressure readings. This air relief assembly helps vent excess air so the filter can operate more efficiently and more consistently.

Common Replacement for DE and Cartridge Filters

The DEX2420MAR2 is commonly used on compatible Hayward Pro-Grid DE filters and SwimClear cartridge filters, making it a frequently needed repair part for residential pool equipment systems.

Updated Replacement Assembly

This part is commonly listed as the updated revision for older DEX2420MAR assemblies and is used as a replacement on compatible filters that originally used the previous version.

Top-Mounted Filter Installation

The assembly installs at the top of the filter tank where air collects, allowing air to be released before and during system operation according to Hayward’s safety instructions.

Benefits

• Helps release trapped air from compatible Hayward filters
• Supports proper circulation and filtration performance
• Assists with safer filter startup and servicing
• Helps maintain accurate pressure management
• Genuine Hayward part for dependable fit and function
• Common repair part for Pro-Grid and SwimClear filters
• Useful replacement for leaking, damaged, or worn air relief assemblies
• Helps restore proper manual venting operation

Specifications

Customer-Facing Q&A

Q: What does the Hayward DEX2420MAR2 do?
A: The DEX2420MAR2 allows trapped air to be manually released from compatible Hayward pool filters. This helps the filter operate properly and supports safer pressure management during startup and servicing.

Q: Is this a genuine Hayward part?
A: Yes. This listing is for the genuine Hayward Manual Air Relief Assembly, part number DEX2420MAR2.

Q: Which filters does this fit?
A: This assembly is commonly used with Hayward Pro-Grid DE filters and Hayward SwimClear cartridge filters. Customers should confirm their filter model before ordering.

Q: Does this replace DEX2420MAR?
A: Yes. DEX2420MAR2 is commonly listed as the updated replacement for DEX2420MAR on compatible Hayward filters.

Q: Does this include the pressure gauge?
A: This assembly is commonly sold with the pressure gauge included. Customers replacing a complete top air relief assembly should verify the included components before installation.

Q: When should this part be replaced?
A: Replacement is recommended when the existing air relief assembly is cracked, leaking, difficult to open or close, missing parts, or no longer sealing properly.

Q: Is this part important for safety?
A: Yes. Manual air relief valves help release trapped air from pressurized filter systems. Always follow Hayward’s instructions and stand clear of the filter during startup.