Description
Astralpool o-ring 38 x 5 mm 4405010439
The Astralpool o-ring 38 x 5 mm 4405010439 is a replacement elastomer seal designed to restore watertight joints on compatible Astralpool
pool equipment. With an internal diameter of approximately 38 mm and a 5 mm cross section, it fits precisely in its dedicated groove and
provides a reliable, long lasting seal in everyday filtration operation.
Main features of the o-ring 38 x 5 mm
- Original style o-ring with 38 mm inner diameter and 5 mm section.
- Designed for Astralpool components that specify reference 4405010439.
- Round cross section for uniform compression in standard o-ring grooves.
- Elastomer material suitable for treated pool water and normal operating temperatures.
Function in the filtration system
This o-ring is installed between two rigid parts, such as a union tailpiece, valve insert or inspection cap. When the parts are assembled
and tightened, the Astralpool o-ring 38 x 5 mm 4405010439 is slightly compressed, filling the gap and preventing water or air from passing
through the joint. A sound seal helps maintain stable suction and pressure and keeps the technical room dry and clean.
- Provides a watertight and airtight barrier at critical joints.
- Helps the pump maintain correct priming and stable flow.
- Reduces the risk of small leaks and damp patches around fittings.
Compatibility and typical applications
The Astralpool o-ring 38 x 5 mm 4405010439 is intended for use on specific Astralpool pumps, filters or accessories that list this
reference in their exploded view or spare parts list. Its dimensions are matched to the original groove design, so the seal can be
installed directly without modification.
- Suitable for Astralpool equipment that specifies o-ring 4405010439.
- Ideal for replacing worn or flattened seals on compatible unions or caps.
- Recommended as a spare in maintenance kits for installations using Astralpool components from PoolParthub.com.
To ensure correct selection, always check the parts diagram or documentation for your exact model before ordering this reference.
When to replace the Astralpool o-ring 4405010439
O-rings are consumable parts and gradually lose elasticity due to pressure cycles, temperature changes and exposure to pool chemicals. A
tired or damaged seal can allow leaks or air entry, which quickly affects filtration comfort and pump behaviour.
- Flattened, shiny appearance indicating long term compression in the groove.
- Visible cracks, cuts or rough areas on the o-ring surface.
- Persistent drips at the joint even after careful cleaning and tightening.
- Air bubbles visible in transparent sections or under pump lids during operation.
Installation and maintenance tips
Fitting the Astralpool o-ring 38 x 5 mm 4405010439 is simple, but careful preparation helps ensure a reliable seal and longer service
life. The system must always be switched off and depressurised before opening any sealed component.
- Isolate the pump, close valves and release pressure from the relevant section.
- Remove the old o-ring and clean the groove and mating faces to remove dirt and scale.
- Check that the new o-ring is clean, undamaged and sits naturally in the groove.
- Place the seal gently into position, making sure it is not twisted or overstretched.
- Optionally apply a thin film of silicone based lubricant suitable for pool seals to ease assembly.
- Reassemble the parts and tighten evenly by hand, avoiding excessive force that could crush the o-ring.
After restarting filtration, inspect the joint for a few minutes to confirm that the area remains completely dry and that there are no
signs of air being drawn into the circuit.
Good practice for long term sealing
A few regular habits help the Astralpool o-ring 38 x 5 mm 4405010439 deliver effective sealing performance over many seasons.
- Maintain balanced water chemistry to limit chemical stress on elastomer seals.
- Clean sealing surfaces before closing unions or caps to avoid pinching grains of sand.
- Do not use tools to overtighten closures; hand tightening is usually sufficient.
- Replace seals preventively during major services instead of waiting for visible leaks.
With a correctly installed Astralpool o-ring 38 x 5 mm 4405010439, compatible fittings regain secure, watertight joints that support
stable, efficient filtration in daily pool operation.
