Stainless steel plugs, Dnipropetrovsk region.

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The stainless plug is intended for tightly closing the pipeline. The stopper is made by the method of hot stamping from stainless steel.
The elliptical plug is made according to the German DIN standard, according to the international ISO standard, according to the Swedish SMS standard. The matte stainless end cap has a smooth surface. Polished (mirror) capable of reflecting objects.(//tractor-service.com)
AISI 304 stainless plugs are used in environments with an oxidizing nature: with strong sulfuric, perchloric, nitric, hydrochloric acid at low concentration and low temperature or for weak malic, citric, tartaric, lactic, acetic acid at medium temperature. AISI 304 steel resists corrosion well in the open air. The following are recommended in the equipment and components of pipeline fittings that work in contact with food products in a cooled or heated state: naturaljuices, wine, beer, alcohol, milk (fermented milk products).

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