For pumping nipple balls often use Bicycle pump with a special needle. But it does not matter if it broke or its just not there at hand: with this work well covered by a normal Bicycle nipple off a rubber tube mounted with its threaded shank in the hole of the pump.
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To check the operation of the trailer's lighting system, two people are needed: the driver turns on the switches and presses the brake pedal, while an assistant monitors whether the...
