Pentair Sta-Rite 24851-9001 Upper Tank Half Kit (25") for System:3 | 24851-9001

Pentair / Sta-Rite 24851-9001 Upper Tank Half Kit (25") for System:3 Filters

The Pentair / Sta-Rite 24851-9001 is the OEM upper tank half (tank top / lid) kit used on select Sta-Rite System:3 filter systems with a 25-inch tank. This part replaces the top half of the filter housing when the original is cracked, warped, leaking, or the clamp interface is damaged. It is commonly supplied as a kit and is often listed as including the factory decals/labels.

Common Compatibility (Verify Your Filter Model)

• Sta-Rite System:3 Modular Media: S8M150, S8M500
• Sta-Rite System:3 Modular D.E.: S8D110 (select configurations)
• Sta-Rite System:3 High-Rate Sand: S7S70 (select configurations)

System:3 parts can vary by series (SM/SD/SS) and tank size. Confirm your exact filter model and parts diagram before ordering.

Key Details

• Part number: 24851-9001
• Part type: Upper tank half / tank top (lid) kit
• Tank size: 25" System:3 tank
• Typical use: Replaces the upper shell when the tank top is damaged or leaking

When to Replace the Upper Tank Half

• Hairline cracks, stress fractures, or seepage from the tank top
• Warping or deformation that prevents the tank O-ring from sealing
• Damage at the clamp/locking-ring interface that prevents safe, even clamping
• Repeated leaks after replacing the tank O-ring and confirming clean, undamaged sealing surfaces

Installation Notes

• Turn off the pump and relieve all pressure from the filter before opening.
• Inspect the tank O-ring and replace it if flattened, cracked, swollen, or nicked.
• Clean sealing surfaces thoroughly; debris or scale can cause leaks even with new parts.
• Reassemble and tighten the clamp evenly per the manufacturer’s procedure (do not over-tighten).
• Restart the system and check for slow seepage after the filter reaches full operating pressure.

Related Products (Aqua Pool Supply)

• 24851-9001 Upper Tank Half (Search)
• System:3 Tank O-Ring / Seal (Search)
• S8M150 Cartridge Modules (Search)
• S8M500 Cartridge Modules (Search)
• Pool-Safe Silicone O-Ring Lubricant (Search)

Maintenance Tips

• Keep the tank O-ring clean and lightly lubricated with pool-safe silicone lubricant to reduce pinching and leaks.
• Never open the filter until pressure is fully relieved—this protects equipment and prevents damage to sealing surfaces.
• If the filter is in direct sun, provide shade when possible to help extend plastic tank life.
• Record your clean starting pressure after service; a rising baseline can indicate restriction or system changes.