Aladdin

O-343-0

Filter Body & Tank O-Ring replaces Pentair 87300400Z, U9-389, U9-200, U9-399

$4.50
Shipping calculated at checkout.
Fast shipping
Ships in 2 to 3 business days

Pickup available at Marathon FL

Usually ready in 24 hours

View Specifications
Product Description

The Aladdin O-343-0 Filter Body & Tank O-Ring is a high-quality, professional-grade replacement seal designed for a wide range of pool and spa filtration systems. Precision-engineered to create a watertight, pressurized seal between the upper and lower halves of the filter tank, this O-ring is critical for preventing leaks and maintaining system pressure. It is the industry-standard "drop-in" replacement for Pentair, Sta-Rite, and American Products filters. Made from durable, chemical-resistant rubber, it ensures a reliable, leak-free repair for your large-capacity cartridge or D.E. filter housing.

Key Features

  • Universal Compatibility: Seamlessly replaces Pentair 87300400ZSta-Rite U9-389U9-200, and U9-399.
  • Versatile Fit: Designed for elite models, including Pentair Clean & Clear PlusSystem 3, and FNS Plus D.E. Filters.
  • High-Grade Elastomers: Built with durable Buna-N rubber to withstand high-pressure cycles and pool chemicals.
  • Critical Pressure Seal: Prevents water bypass and air leaks, ensuring your filtration system runs at peak efficiency.
  • Direct OEM Equivalent: Engineered to meet or exceed original manufacturer specifications for a perfect, airtight fit.
  • Weather Resistant: Designed to maintain flexibility and resist cracking even under extreme outdoor temperature fluctuations.

Specifications

Specifications

Aladdin O-343-0 Filter Body and Tank O-Ring

High-performance replacement seal designed to provide a watertight, pressurized barrier for large-capacity pool filtration systems. Engineered for durability, this heavy-duty O-ring ensures leak-free operation for multiple major filter brands.

Technical Dimensions
Outside Diameter (OD)~9.5" to 9.75"
Inside Diameter (ID)~9.0" to 9.25"
Thickness0.25" to 0.275" (1/4")
MaterialHeavy-Duty Rubber
UPC601402121890
Cross-Reference Guide
Pentair / Am. Products87300400 / 87300400Z
Sta-RiteU9-200 / U9-389 / U9-399
SSC / OtherO-1011 / 47044706R
Part NumberO-343 / O-343-0
Shipping Weight~2 to 9 oz
Universal Series Compatibility
Pentair / American Products: Clean & Clear, Predator, Warrior, Posi-Clear RP, EasyClean D.E. Series
Sta-Rite: PLBC series tank systems, modular media filters

⚠️ Critical Safety & Installation Warnings

HIGH-PRESSURE HAZARD: Pool filter systems operate under extreme pressure. Always open the manual air relief valve to bleed all trapped air before starting the pump to prevent catastrophic lid separation.
MAINTENANCE INDICATOR: Replace the O-ring immediately if it appears flattened, shows signs of cracking, or leaves a black residue on your fingers when touched (indicates rubber degradation).
LEAK PREVENTION: Even a tiny grain of sand or a pebble on the tank rim can prevent a proper seal. Ensure both upper and lower housing rims are wiped perfectly clean before seating the O-ring.
SEATING HAZARD: An improperly seated O-ring can be pinched by the tank clamp, leading to immediate failure or a high-pressure blowout. Verify the O-ring is flush in its groove before tightening the clamp.
💡 Professional Tips for Success
  • Lube Rule: Use only silicone-based lubricants (e.g., Aladdin Magic Lube). Never use petroleum-based products like Vaseline, as they cause rubber to swell and fail permanently.
  • Gentle Seating: After installing the tank clamp, tap it gently with a rubber mallet while tightening the nut to ensure the clamp and O-ring are seated uniformly.
  • Manufacturer Note: This is a high-quality aftermarket replacement part. All manufacturer names and part numbers are used for reference purposes only.
PROCEED WITH CAUTION: Servicing pressurized pool equipment involves risk of property damage or serious injury. Professional installation by a licensed pool technician is highly recommended. Always verify the filter model's requirement for the O-343 size before installation.
NON-RETURNABLE: This is a precision sealing component. Many retailers will not accept returns once the O-ring has been removed from its original packaging, lubricated, or installed.
CALIFORNIA PROPOSITION 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.
WARRANTY & DATA: As a wearable maintenance component, this product typically carries no written manufacturer warranty. Reliability depends on proper lubrication and installation technique. Specifications are sourced from Aladdin Equipment Co. and industry cross-reference documentation.