Head Gasket TetraTec EX 400/700 – replacement seal for TetraTec EX series models

Replacement head gasket for TetraTec EX 400 and EX 700 external aquarium filters. This sealing gasket is designed for the EX series head assembly to restore a watertight connection between the filter head and the filter body, helping to prevent leaks and to maintain correct pressure and flow through the unit. The part is suitable for routine maintenance and repair of home and hobby aquariums using TetraTec EX 400 or EX 700 filters.

Advantages

The gasket provides a precise seal shaped to match the EX series head geometry, reducing the risk of water escaping at the head-to-body joint. It is made from flexible sealing material that tolerates repeated assembly and disassembly, enabling straightforward maintenance. Using the correct replacement gasket helps maintain filter performance and consistent flow rates by preventing pressure loss caused by imperfect sealing.

Suitable for

• Replacing worn or damaged head gaskets on TetraTec EX 400 external filters
• Replacing worn or damaged head gaskets on TetraTec EX 700 external filters
• Routine maintenance to prevent leaks and pressure loss in home and hobby aquariums
• Repairing filter head assemblies after disassembly for cleaning or inspection

Key specifications

• Compatibility: designed to fit TetraTec EX 400 and EX 700 external filter head assemblies
• Function: sealing gasket for head-to-body connection to prevent leaks
• Material: flexible sealing elastomer suitable for aquarium use
• Form: pre-moulded shape matching EX series head geometry for reliable sealing

How to use

Turn off and unplug the filter, then disconnect input and output hoses. Open the filter head according to the manufacturer’s instructions and remove the old gasket. Clean the sealing surfaces of the head and body to remove debris and residue, then position the replacement gasket in the head recess ensuring correct orientation and full seating. Reassemble the head onto the filter body, reconnect hoses, and restore power. Check for leaks and normal flow before leaving the filter unattended.

Usage recommendations

Use only genuine replacement gaskets matched to the EX series to ensure correct sealing. Inspect the gasket during routine maintenance and replace it if you observe cracking, permanent deformation, or persistent leaks. Ensure sealing surfaces are clean and dry before fitting the gasket to maximize lifetime and effectiveness.