Pressurebox Core - FAQ, User Guide and Troubleshooting
Here you’ll find frequently asked questions, guides, and tips for the Pressurebox Core series.
1. Before Use
When you receive your Pressurebox, open and close the lid a few times to get familiar with the threading.
You may notice a small amount of protective coating on the outside of the lid or container. This coating is applied to protect the internal threads and ensure smooth operation. During transportation, a small amount may appear on the outside and can simply be wiped off.
2. Closing
Close the lid firmly, but use no excessive force, as pressure containers can become harder to open over time. The position where the logo on the lid aligns with the transparent window on the cylinder provides optimal airtightness. If you need easier opening, you can generally close it 1–2 cm less than this point, and it will still be very airtight.
3. Pumping
Pump your Pressurebox using a Schrader bike pump, such as the Pressurebox Pump.
Push the pump head down firmly onto the valve to ensure a proper connection so air can flow into the chamber. Monitor the pressure on the gauge (manometer) while pumping.
Recommended pressure: 20–30 PSI — higher pressure gives faster restoration but may make balls too hard if stored for long.
Never exceed 30 PSI.
4. Deflate
Remember to always press the deflate button on the lid before opening the box.
5. Opening
To open it easily, hold the cylinder against your chest with the bottom of your palm, using your full hand rather than your fingers, and rotate the cylinder and the lid in opposite directions (see image).
How-to-Guides and Solutions
Please try the steps below if your product is leaking air.
1. Ensure the lid is properly closed
Close the lid firmly, but do not use excessive force, as pressure containers can become harder to open over time.
Optimal airtightness is achieved when the logo on the lid aligns with the transparent window on the cylinder.
If you prefer easier opening, you can usually stop 1–2 cm before this point—the container will still be very airtight.
2. Test without the valve cap
Try using the Pressurebox without the rubber valve cap on the lid to ensure it is not causing the leak. A misaligned valve cap may press down on the deflate valve, causing air to release.
3. Check the threads
Make sure the threads on both the lid and the cylinder are clean and free from dirt or debris.
4. Reinstall the O-ring
Remove the black rubber O-ring located on the outside of the cylinder. Turn it around and place it back into its designated groove.
The O-ring is loose and easy to remove. Ensure it is seated correctly and evenly in the groove.
If you have grease available, you may apply a small amount to the O-ring before reinstalling it.
5. Check the deflate button
Ensure that the deflate button is not stuck in the open position by pressing it up and down several times, to make sure it moves freely.
If this still does not help, remove the lid, turn it upside down, and use a screwdriver or a similar non-sharp object to firmly press the valve located directly beneath the deflate button from underneath. This will push the deflate button upward.
This should ensure that the deflate valve is not stuck open.
6. 1-Minute Water Test (Airtightness Check)
After completing the steps above, you can perform a quick airtightness test.
- Pump the container to 20–30 PSI.
- Hold the product over a sink (water may leak out from the pressure gauge mount).
- Pour water into the inflation area so that it fills the whole lid and reaches the top.
- Observe whether air bubbles appear.
If you see a continuous stream of bubbles from any valve or seal, please record a short video and submit a reclamation using this form.
For easier opening, avoid tightening the lid too hard when closing the box.
If the lid has been closed too tightly and is difficult to open, try the following steps:
1. Make sure the box is fully deflated, and use the grip shown in our guide and in the information email you received.
2. If it still won’t open, try using a glove (thin skin gloves provide the best grip), a towel, or ask someone stronger to help.
3. If the lid remains stuck, gently tap around the lid threads with a spoon to reduce friction, then try opening it again.
4. Ask someone for help. One person should hold the lid firmly with both hands while the other twists the container.
5. If you are still unable to open the box, please contact us and we will be happy to help.
Situation: The balls are too hard
Since the pressure inside the Pressurebox is higher than the internal pressure of tennis and padel balls, the balls may become too hard if left in the box for an extended period and/or if too much pressure is applied.
This is easy to resolve: use lower pressure (for example, 20 PSI instead of 30 PSI) and/or open the box some time before playing and allow the balls to rest outside of the pressurized environment. The balls will gradually soften as the pressure equalizes.
Situation: The balls are not hard enough
If you want faster pressure restoration or firmer balls, pump up higher pressure, but never exceed 30 PSI.
If the balls are very soft or old to begin with, restoring pressure may take longer and you may need to start with lower pressure to avoid implosion of the balls. For best results, start with balls that still have some pressure and use the Pressurebox regularly between sessions to maintain optimal ball performance.
Shipping, Payments & Partners
We ship to most countries worldwide with UPS. When you add a product to the checkout and insert your address, you will be able to choose your country in the drop-down filter and see shipment options with costs. If you cannot find your country in the list, it might be because UPS has restrictions, or because we have an exclusive reseller in the country. Just reach out to us, and we will advise you what to do.
The shipping alternatives that we offer depends on your location, and the available options will be displayed in the cashier once you have submitted your address. For most destinations we work with UPS. We also offer Express shipping with UPS Express Saver.
The payment options that we offer depends on your location, and the available options will be displayed in the cashier. For most markets we support all common credit cards, and Paypal.
Yes, we work with selected resellers, clubs and partners in a number of countries worldwide. Please contact us for more information.