Should be fine.
I have seen threads of this inlet outlet pipe gets stripped when people screw and unscrew their
hoe hoses on regular basis, I suggest just screw it once and leave it, and also don't over tighten it.
Otherwise this Quick connect/disconnect accessory exists, which is made of brass, much higher quality. But if we are trying to spend as little as possible on a machine which is not meant to be reliable, then it's better to just avoid. Set it up once and leave it.
How the machine works?
This may help you take better care of the machine, once you understand the inner workings.
There is a pressure switch inside the machine, it's job is to turn off the motor once the pressure inside your outlet hose where the gun is attached at the end, reaches a preset value. So if there is a leak on the outlet side somewhere (hose+gun), motor might not stop on it's own, when you de-press the gun trigger.
When you press the gun trigger, it creates a small opening at the end of the gun, basically we intentionally create a leak, the pressure switch detects that leak and turns ON the motor, and you get pressurized water flow, as soon as you de-press the gun trigger, that small opening is closed now, and the pressure inside reaches a threshold value and the pressure switch turns off the motor.
Never ever try to unscrew the outlet hose when it is pressurized, you basically won't be able, upon force it can be damaged, this is most common mistake people make. Release the pressure first by holding the gun trigger.
Which means after the washing is done, kill the main power switch and release the pressure. We don't want the hose to stay pressurized when not in use.