Question 1

How do I close Pressurebox Pro properly the first time?

Accepted Answer

Open and close the lid a few times, then close it firmly without overtightening.

When the container is new, it's a good idea to get a feel for the thread first. For the best seal, you'll normally close it to the point where the logo lines up with the window. On brand-new containers you can often stop slightly before that, so it's easier to open again.

Question 2

Does it need to be switched on all the time?

Accepted Answer

Yes, if you want it to maintain the pressure automatically.

Pressurebox Pro only works automatically when the power button is set to ON. If it's switched off, it won't keep the chamber pressure topped up between your matches.

Question 3

What's the difference between Normal and High mode?

Accepted Answer

High mode restores the pressure faster.

Pro has two pressure modes. Normal is the standard setting, while High is designed to rebuild pressure faster. To switch, hold the Mode button for about 3 seconds while the unit is on.

Question 4

How do I open Pressurebox Pro correctly?

Accepted Answer

Switch it off, press the pressure release button and use your whole hand to open it.

Always switch it off first. Then press the pressure release button on the lid before you unscrew it. Hold the tube against your chest with your palm and twist the lid and tube in opposite directions for a better grip.

Question 5

Can I make the Pro easier to open?

Accepted Answer

Yes, you can remove the secondary O-ring on the thread.

Pressurebox Pro has a double sealing system. If the lid feels too tight, you can remove the secondary O-ring on the tube's thread. The container still seals via the lid's inner seal, but it becomes easier to unscrew.

Question 6

Why does it lose pressure or drain the battery quickly?

Accepted Answer

It's usually a sealing issue, not the electronics.

Start by checking that it's set to ON and closed properly. Then check the O-ring and thread, and make sure the pressure release button isn't stuck in the open position.

Question 7

What do I do if the lid is stuck?

Accepted Answer

Release the pressure first, get a better grip and reduce friction around the thread.

First press the pressure release button. Then use the chest grip, ideally with rubber gloves or a towel. You can also take off the silicone cover, tap lightly around the thread with a spoon, or ask someone to hold the lid while you turn the tube.

Question 8

What do I do if my Pro won't charge, shows no lights or seems completely dead?

Accepted Answer

Use the original cable and fully charge it so it can reset.

Use the original cable, as not all USB-C cables make a proper connection. Then fully charge it until all four lights stop flashing, unplug the cable and try again.

Question 9

What do I do if the compressor won't start?

Accepted Answer

First check whether it's still plugged into the charger.

The compressor doesn't run while charging. Charge it fully, unplug the cable and switch it on again. If the problem continues, please contact customer service.

Question 10

Why am I seeing a red light or getting very short battery life?

Accepted Answer

It's often a sign of a leak or a poor seal.

A red light, frequent pump starts and short battery life usually mean the container isn't holding pressure properly. Check how it's closed, the O-ring, the thread and the pressure release button. If you can't solve it, sending us a short video is the best next step.

Question 11

What if the balls don't feel any different?

Accepted Answer

Use balls with some pressure left, and make sure it's switched on.

If the balls are very flat to begin with, it takes longer to bring them back. Ideally use balls that still have some life in them, make sure the power button is set to ON, and try High mode if needed. The fairest test is to compare used balls from the Pressurebox with fresh balls after about a week.

Question 12

My balls have become too hard after storage. What do I do?

Accepted Answer

Take the balls out a little before you play so they can settle.

Balls that have been in the container for a long time can feel firmer. That's normal - take them out 15-30 minutes before you play so they can adjust to the surroundings.

Question 13

What should I do before using it for the first time?

Accepted Answer

Open and close the lid a few times to get a feel for the thread. The first time, it helps to get a feel for how the lid runs on the thread. That makes both closing and opening it later easier.

Question 14

How do I close Pressurebox Core properly?

Accepted Answer

Close it firmly, but without using unnecessary force. For the best seal, the logo on the lid should usually line up with the transparent window on the tube. On brand-new containers you can often stop a little before that to make opening easier. If you're using it without the small O-ring on the tube, close it slightly tighter.

Question 15

Can I make the Core easier to open?

Accepted Answer

Yes, you can remove the secondary O-ring on the thread.

Pressurebox Pro has a double sealing system. If the lid feels too tight, you can remove the secondary O-ring on the tube's thread. The container still seals via the lid's inner seal, but it becomes easier to unscrew.

Question 16

Which pump should I use for Pressurebox Core?

Accepted Answer

Core works with a bike pump with a Schrader (car-type) valve. Core is compatible with a bike pump with a Schrader valve - the same type used on car tyres and many bike tyres. If your package includes the Pressurebox Pump, you can use that. Otherwise, any standard bike pump with a Schrader connector will do.

Question 17

How much pressure should I use?

Accepted Answer

The recommended range is 20-30 PSI. Never go above 30 PSI. Higher pressure rebuilds the balls' pressure faster, but can make them too hard if they stay in the container for a long time. 20-30 PSI is the recommended working range. 30 PSI is the absolute maximum - don't go above it.

Question 18

How do I pump correctly?

Accepted Answer

Make sure the pump head seals tightly on the valve, and keep an eye on the pressure. Press the pump head firmly onto the valve so the air actually goes into the chamber. Keep checking the pressure gauge as you pump, and stop when you reach the range you want.

Question 19

Should I release the pressure before opening the Core?

Accepted Answer

Yes, always press the pressure release button before opening. It makes opening easier and reduces wear on the thread and seals. It's the right order every time.

Question 20

What's the easiest way to open the Core?

Accepted Answer

Use your whole hand and hold the cylinder against your chest for a better grip. Hold the tube against your chest with the heel of your hand and twist the lid and tube in opposite directions. It works much better than just using your fingers.

Question 21

What do I do if the Core leaks air?

Accepted Answer

Check the closure, valve cap, thread, O-ring and pressure release button - in that order. Start by making sure the lid is closed properly. Then check that the valve cap isn't pressing the valve down and that the threads are clean. Take the O-ring off, put it back correctly and add a little grease if needed. Finally, check that the pressure release button moves freely.

Question 22

What do I do if the pressure release button is stuck?

Accepted Answer

Press it up and down several times - only move on to the next step if that doesn't help. If the button is still stuck, you can take the lid off, turn it upside down and gently push the valve under the button up from below with a blunt object. This is a last resort and shouldn't be the first thing you try.

Question 23

What do I do if the lid is stuck?

Accepted Answer

Release all the pressure and get a better grip before trying anything harsher. Start with full ventilation and the breaststroke grip. If that doesn't help, try gloves or a towel, gently tap around the thread with a spoon, or have someone else hold the lid while you turn the container.

Question 24

My balls have become too hard. What do I do?

Accepted Answer

Lower the pressure or open the container a little before you play. If the balls sit under high pressure for a long time, they can become firmer than you'd like. Use a lower pressure, for example 20 PSI instead of 30 PSI, and let them rest without pressure for half an hour before your match if needed.

Question 25

My balls don't feel hard enough. What do I do?

Accepted Answer

Use a slightly higher pressure within the limit, and ideally start with balls that still have some life in them. You can increase the pressure as long as you stay at or below 30 PSI. If the balls are very flat to begin with, it takes longer to bring them back. For the best results, use the container regularly between matches.

Question 26

What do I do if it leaks air, starts often or the battery seems weak?

Accepted Answer

Start with how it's closed and the thread, then move on to the O-ring and pressure release button. Make sure it's switched on and closed firmly without overtightening. Check the thread for dirt. If that doesn't help, lightly grease the O-ring on the inside of the lid and apply a little grease around the pressure release button. As a final step, you can adjust the top section - see the guide below. An underwater test can help you find where it's leaking.

Question 27

What should I tell support if the problem persists?

Accepted Answer

Describe what happened after each step you tried. The more precisely you can describe how it behaved after each step, the faster we can help. A short video is always the best addition to a description.

Question 28

What do I do about electronics problems on older Tennis/Padel models?

Accepted Answer

Leave it switched off overnight, charge it fully, then try the mechanical steps. Leave it switched off overnight, charge it until all four lights stop flashing, and unplug the cable before use. If it still won't start, tap the compressor section lightly and try it without the silicone cover. These steps only apply to the older models.

Question 29

How do I make older models easier to open?

Accepted Answer

Don't close it too tightly, and always release the pressure before you try to open it. If it's already stuck, release all the pressure first. Then use gloves or a towel, tap lightly around the lid with a spoon and take off the silicone cover for a better grip if needed.

Question 30

My balls have become too hard. What do I do?

Accepted Answer

Open the container a little before you play so the balls can settle. If the balls have been under pressure for a long time, they can become harder than you'd like. Take them out 15-30 minutes before you play.

Question 31

My balls don't feel hard enough. What do I do?

Accepted Answer

Ideally start with balls that still have some pressure left, and use the container regularly. If the balls are very flat to begin with, it takes longer to bring them back. The best results come from regular use between matches with balls that aren't completely dead.

Question 32

Is there a guide for the O-ring in the lid?

Accepted Answer

Yes - it shows how to take out, grease and refit the O-ring. Carefully take out the O-ring on the inside of the lid, grease it with a thin layer of neutral Vaseline or similar, and put it back correctly. Then close the lid firmly a few times so the ring seats properly.

Question 33

Is there a guide to adjusting the top section?

Accepted Answer

Yes - but it only applies to older models, not Core or Pro. The guide starts with removing the silicone cover around the USB-C port. You then loosen the top section, check and grease the O-rings, and tighten the top section again. Follow the guide carefully and don't overtighten.

Get help with your Pressurebox

Getting started

Opening and sealing

Battery and electronics

Ball pressure and performance