AstroAI CZK-3631 (AIRUN H) 12V Portable Tire Inflator

A 12V glovebox pump for tires, sold under two names

Amazon sells this as the AstroAI AIRUN H. The listing's own details table and the maker's manual both call the hardware CZK-3631, and the manual's title page calls it the AstroAI 100PSI Portable Car Air Pump. The manufacturer part number on the listing is A220B. If you are comparing manuals or ordering a spare fuse, CZK-3631 is the number that matches the maker's documentation.

The manual's package list is the pump, two air nozzles, one needle valve adapter, one Presta-to-Schrader adapter, one replacement fuse and the manual. The Amazon bullet adds an extension hose to that list. The maker's own packing list does not mention one, so check what actually arrives before you count on it.

The maker's product page gives the body as 7.4 by 3.5 by 5.9 inches and 1.75 pounds; the manual gives the same dimensions in metric as 18.8 by 8.8 by 15 cm. Amazon's table says 1.76 pounds and an Amazon bullet says 2.2 pounds, so the weight figures do not agree across the listing itself.

It runs off a 12V socket only, and the manual wants the engine running

The manual's specification table lists DC 12V working voltage, 15A maximum current and 120 watts. Its warnings say plainly not to use the product with a 24V car power supply and to connect it to a 12V DC, 15A cigarette lighter. There is no battery and no AC option described anywhere in the manual, so this is a pump that only works where there is a live 12V socket.

Step one of the manual's operating instructions is to make sure the car engine is running before using the pump. The troubleshooting page adds that if it will not inflate you should check that the in-line fuse is seated correctly and that the vehicle's cigarette lighter fuse is rated at 15A. On a car whose accessory socket is on a smaller fuse, that is a problem to find out about before you need the pump.

Fifteen minutes on, ten minutes off

The manual's specification table lists continuous operating time as 15 minutes maximum, and its warnings section says to avoid extended and continuous use, then to let the pump rest for 10 minutes after 15 minutes of continuous use. The troubleshooting page repeats this from the other direction: if inflation has gone slow, excessive use is a cause, and you should let it cool for at least 10 minutes.

The two sources word this differently. The Amazon bullet describes thermal management with an auto shut-off after 15 minutes of continuous use. The manual phrases the 15 minutes as an instruction to the operator rather than as an automatic cut-out, and nothing in the manual we read describes the pump stopping itself on time. We are not able to say from these sources whether the timer is enforced by the pump, so plan to watch the clock yourself.

The manual also warns that during use you should not touch any part of the pump other than the switch and the handle, because the device gets hot in use and stays hot for a while afterwards. That matters when you are moving it between four tires in one session.

The hose is 50 cm; the 9.84 feet is the power cord

This is the easiest thing to misread on the listing. Amazon's details table has a single line reading Hose Length 3 meters. The maker's manual splits it into two rows: inflation hose length 1.64 ft (50 cm), power cord length 9.84 ft (3 m). The 3 metres is the 12V lead that reaches from the dashboard socket to a rear tire, and the air hose itself is about a foot and a half.

Practically that means the pump body sits on the ground next to the wheel, not in your hand at the valve. The manual's highlight text makes the same point, saying the 9.84 ft cord lets it reach a car's rear tires. If you were hoping to leave the unit on the seat and run a long hose out, this is not that design.

Pressure, preset shut-off, and what the two sources say it can inflate

The manual's table gives a maximum working pressure of 100 PSI and four display units: PSI, Bar, kPa and kg/cm². Its warnings add that those four are units, not pressure levels, and that you should check the preset value before you start. The introduction and the highlights both state that the pump shuts off automatically once the preset pressure is reached. Neither the manual nor the maker's page states a gauge accuracy figure, so we do not publish one.

The manual says the preset must be higher than the tire's current pressure or the pump will appear to do nothing, and it points you at the pressure label inside the driver's door rather than giving numbers of its own. It is a sensible habit: the troubleshooting page lists a too-low preset as a cause under both abnormal operation and failure to inflate.

On what it fits, the manual says the quick connector works with all Schrader valves and can be used with car, SUV, motorcycle and bicycle tires, and that the included accessories also suit swimming rings, basketballs and soccer balls. The Amazon bullet says the opposite about inflatables, calling it not designed for high-volume items such as pool floats or air mattresses. The manual does not state any truck or RV limit. We report both statements; the sources conflict and we do not pick one for you.

Flow claims, cleaning and the two-year warranty

Speed and airflow only appear on the sales side. The Amazon bullet claims a 120W motor with up to 35 L/min of airflow and a 30-to-36 PSI top-up in under a minute under ideal conditions, and the maker's page has a 1-Minute Inflation panel. Amazon's own details table separately lists Air Flow Capacity as 1.23 litres per minute, which does not agree with the bullet. The manual gives no flow rate at all, so treat the speed figures as marketing rather than specification.

For care, the manual says not to use the product in rain or near liquids, to keep it away from fire, corrosive gases and strong magnetic fields, and not to store it somewhere hot or humid. It says not to use chemical cleaners and to clean the plastic parts only with mild soap and a cloth dipped in hot water. It also asks you to disconnect it from power when it is not in use.

The warranty page states a 2-year limited warranty from AstroAI against defects in material and workmanship, covering the original purchaser only and not transferable. It excludes damage from neglect, misuse, contamination, alteration, accident, or abnormal operating or handling conditions. Amazon's details field also says 2 Year Manufacturer. Because the warranty is tied to the original purchaser, check the seller and condition of the offer you choose.