Aquatonics Manual Air Relief Valve Assembly DEX2420MAR2 — Pressure Gauge, O‑Rings, Tool‑Free Install

If your pool filter is showing high pressure or air pockets, swapping in a reliable relief assembly can bring water flow back to normal and help you know when to service the media. The Aquatonics DEX2420MAR2 is built from corrosion-resistant materials, includes a better pressure gauge and all necessary seals, and fits many popular DE and cartridge filter models from Hayward, SwimClear and DEP. Installation is straightforward and tool-free, so routine maintenance is fast and inexpensive.

How will this valve improve my filter's performance?

The replacement assembly vents trapped air that can form above filter media and block water pathways. Removing that air lowers pressure spikes, restores steady flow, and reduces stress on the filter housing and pump. The upgraded gauge also gives clearer pressure readings so you can time cleanings more effectively.

• Expels trapped air to eliminate flow restrictions.
• Reduces sudden pressure increases that cause wear.
• Gauge visually informs when backwash or cleaning is needed.
• Sealed construction prevents leaks after installation.

Which filters and part numbers does this replace?

The Aquatonics DEX2420MAR2 is compatible with Hayward Pro Grid DE models (DE2420–DE7220), SwimClear cartridge and SwimClear series models, and DEP 500 series units. It directly replaces multiple OEM part numbers for a seamless swap without modification.

• Fits Hayward Pro Grid DE2420, DE3620, DE4820, DE6020, DE7220.
• Compatible with SwimClear C-series cartridge and SwimClear DE models.
• Replaces DEX2420MAR, HAY-051-2420, HPPDEX2420MAR2, and 17-150-1308.
• Includes O-rings and gaskets for immediate installation.

How difficult is installation and what do I need?

Installation is designed to be quick and tool-free. You simply remove the old valve assembly, clean the mounting area, lubricate the supplied O-rings, and insert the new assembly until it seats securely. Most homeowners can complete the change in minutes without a technician.

• No special tools or adhesives required.
• Lubricate included O-rings for proper sealing.
• Hand-tighten until the assembly is snug and centered.
• Test system pressure after restart to confirm seal and gauge operation.

What materials and features ensure long-term reliability?

The DEX2420MAR2 uses corrosion-resistant components and improved sealing to withstand pool chemicals and outdoor exposure. The upgraded pressure gauge is engineered for clear, repeatable readings and the assembly includes replacement gaskets to prevent leaks over time. Built for durability, it reduces the need for frequent replacements.

• Sturdy, corrosion-resistant construction for longevity.
• Improved pressure gauge for accurate monitoring.
• Included O-rings and gaskets for leak-free installation.
• Designed as a direct OEM-style replacement for reliable fit.

Who is this for: Pool owners and maintenance professionals using Hayward Pro Grid DE, SwimClear cartridge or DEP 500 series filters who want a fast, reliable way to remove trapped air, restore correct filter pressure and get clearer water without complicated repairs. It’s ideal for anyone seeking a cost-effective replacement part that installs quickly and offers long-term corrosion resistance and dependable gauge feedback.