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Filter Body & Tank O-Ring

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

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 87300400Z, Sta-Rite U9-389, U9-200, and U9-399.
Versatile Fit: Designed for elite models, including Pentair Clean & Clear Plus, System 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

Name: Filter Body & Tank O-Ring replaces Pentair 87300400Z, U9-389, U9-200, U9-399
Brand: Aladdin
SKU: O-343-0
Price: 4.50 USD
Availability: InStock

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.