Product Overview

The Pentair Tank Lid Assembly | 178581 is a genuine OEM replacement upper tank lid designed for select Pentair Clean & Clear Plus cartridge filters and Quad D.E. filters.

This replacement lid is specifically compatible with the Pentair Clean & Clear Plus 420-square-foot filter manufactured after November 1998 and the Pentair Quad D.E. 80-square-foot filter. It is designed to replace an upper tank section that has become cracked, warped, damaged, or unable to seal correctly.

Pool filters operate under significant internal pressure. A damaged filter lid should never be patched, modified, or returned to service. Replacing it with the correct Pentair OEM component helps restore proper tank alignment, sealing, and safe filtration-system operation.

This part is model-specific and should not be ordered based only on the filter’s appearance.

Key Features

• Genuine Pentair OEM replacement part
• Replacement upper filter-tank lid
• Fits Clean & Clear Plus 420 filters
• Fits Quad D.E. 80 filters
• Clean & Clear Plus compatibility applies to filters manufactured after November 1998
• Almond or tan factory finish
• Engineered to match the original Pentair tank dimensions
• Helps restore proper tank closure and sealing
• Designed for pressurized pool-filtration systems
• Direct replacement for Pentair part number 178581
• Suitable for residential and commercial pool applications

Benefits

• Replaces a cracked, warped, or damaged upper tank
• Restores proper filter-tank alignment
• Helps prevent water and pressure leaks
• Allows continued use of the existing compatible lower tank
• Avoids replacing the complete filter when only the lid is damaged
• OEM construction provides reliable model compatibility
• Helps maintain safe and efficient filtration-system operation
• Restores the proper mounting area for compatible air-relief components

Specifications

Compatible Filter Models

Pentair part 178581 is designed for use with:

• Pentair Clean & Clear Plus CCP420
• Pentair Clean & Clear Plus 420 sq. ft. cartridge filter
• Clean & Clear Plus 420 filters manufactured after November 1998
• Pentair Quad D.E. 80 sq. ft. filter
• Pentair Quad 80 / DE80

Always confirm compatibility using the filter model number, manufacturing date, serial information, tank label, and original part number.

What Is Included

• One Pentair replacement upper tank lid assembly

The lower tank, tank clamp, tank O-ring, pressure gauge, manual air-relief assembly, cartridges, D.E. grids, drain assembly, and internal filter components should not be assumed to be included unless specifically shown or stated at the time of purchase.

Existing air-relief and pressure-gauge components may need to be transferred from the original lid or purchased separately.

Installation Information

Pool filters operate under high pressure and can cause serious injury if opened or serviced improperly. Installation should be performed by a qualified pool professional.

Before removing the existing lid:

1. Shut off the pool pump at the circuit breaker.
2. Prevent the pump from restarting during service.
3. Open the manual air-relief valve.
4. Confirm that the pressure gauge reads zero.
5. Allow all trapped air and pressure to escape.
6. Remove the tank clamp only after the filter is completely depressurized.

Inspect the lower tank, clamp assembly, tank O-ring, air-relief components, pressure gauge, and sealing surfaces before installing the new lid. Do not reuse a cracked tank, damaged clamp, or deteriorated O-ring.

The upper and lower tank sections must be properly aligned, and the clamp must be installed and tightened according to Pentair’s service instructions.

Confirm Before Ordering

• Confirm Pentair part number 178581.
• Verify the filter is a Clean & Clear Plus 420 or Quad D.E. 80.
• For CCP420 filters, confirm the unit was manufactured after November 1998.
• Check the manufacturing date on the filter label.
• Do not order based only on tank color or appearance.
• This lid does not fit every Clean & Clear Plus filter.
• This lid does not fit every Quad D.E. filter.
• Inspect the lower tank for cracks, deformation, or chemical damage.
• Inspect the tank clamp and hardware before reassembly.
• Determine whether a replacement tank O-ring is required.
• Confirm whether the pressure gauge and air-relief assembly must be transferred.
• Never repair, patch, or reuse a cracked pressure-vessel component.
• Professional installation and inspection are strongly recommended.

Warranty Information

This genuine Pentair replacement part is covered under Pentair’s applicable limited parts-warranty terms.

Warranty eligibility may depend on purchase through an authorized Pentair dealer, correct model compatibility, proper installation, appropriate system pressure, and compliance with Pentair’s installation and service instructions.

Damage caused by incorrect fitment, excessive pressure, freeze damage, chemical misuse, damaged clamps, improper assembly, unauthorized modifications, or continued operation with a damaged filter tank may not be covered.

Keep the original purchase receipt and professional installation invoice for potential warranty service.

Customer Q&A

Does part 178581 fit every Clean & Clear Plus filter?
No. It is specifically designed for the Clean & Clear Plus 420-square-foot filter manufactured after November 1998.

Does it fit the Quad D.E. 80 filter?
Yes. Part 178581 is compatible with the Pentair Quad D.E. 80-square-foot filter.

Will it fit a CCP320 or CCP520?
No. Those filter sizes use different upper tank components.

Will it fit a Clean & Clear Plus 420 made before November 1998?
It is not listed for pre-November 1998 filters. Verify the manufacturing date before ordering.

Is this a genuine Pentair part?
Yes. Part number 178581 is a genuine Pentair replacement component.

Does it include the lower tank?
No. This listing is for the upper tank lid assembly only.

Does it include the tank clamp and O-ring?
Do not assume the clamp or O-ring is included. Inspect these components and order replacements separately when required.

Does it include the pressure gauge and air-relief assembly?
These components should not be assumed to be included unless specifically stated. They may need to be transferred from the original lid.

Can a cracked filter lid be repaired?
No. A cracked or structurally damaged pressure-vessel component should be removed from service and replaced.

Should the lid be professionally installed?
Yes. Pool filters operate under pressure, so professional inspection and installation are strongly recommended.