For providing machine-made and individually fabricated seals and gaskets on the spot a seal or gasket fabricating machine is adapted to the dimensions and conditions of a mobile van-type service vehicle, and is installed within the van-part of the vehicle. The vehicle's van part receives shelves for tools, raw materials for seals and gaskets, service station equipment and driving means independent from the place of use for the seal or gasket fabricating machine. The vehicle with the machine is driven to the location of demand, and the required seal or gasket is fabricated on the spot.