Onga Pantera Cartridge Filter Lid O-Ring (5311400) – 215mm

Genuine Onga Pantera Cartridge Filter Lid O-Ring — part no. / SKU 5311400. This large rubber O-ring seals the tank lid to the filter body on Onga Pantera and compatible cartridge filters. Manufactured from chemical-resistant, UV-stabilised rubber for durability in Australian conditions. A worn or cracked lid O-ring causes water to leak from around the tank lid. Replacing this O-ring restores a watertight seal.

Compatibility

Suits the following cartridge filter ranges:

• Onga Pantera cartridge filters
• Quiptron: BR6000, BR9000, C232, 464, 696, 929, 1500
• Onga: LCF 60, LCF 90, PCF 50, PCF 100
• Trimline MkI (original Trimline, not MkII)
• Para Old Style cartridge filters
• Onga BR cartridge filters
• Stroud SHD cartridge filters

Product Details

• Brand: Pentair (Onga)
• Part number / SKU: 5311400
• Diameter: approx. 215mm
• Thickness: approx. 10mm
• Material: chemical-resistant, UV-stabilised rubber

Frequently Asked Questions

How do I know if this O-ring needs replacing?

If water is leaking from around the tank lid on your cartridge filter, the lid O-ring is the most likely cause. Turn off the pump and relieve system pressure, then remove the tank lid and inspect the O-ring for cracks, flattening, or deformation. Replace if any damage is visible, or as part of routine filter servicing.

Does this suit the Trimline MkII as well as the MkI?

No — this O-ring suits the original Trimline MkI. The Trimline MkII uses a different lid O-ring. If you have a Trimline MkII filter, please check the separate Trimline MkII lid O-ring listing or contact us to confirm the correct part before ordering.

Should I lubricate the O-ring when fitting it?

Yes — apply a small amount of silicone-based O-ring lubricant (not petroleum-based grease) to the O-ring before fitting. This helps the O-ring seat correctly in the lid groove, prevents pinching, and extends its service life.