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[..] Drückt man feste (so wie ich es versucht habe), wird der rote O-Ring an der Kante abgeschert und man hat zwei Ringe.[..]
"Test LaboratoryProducts from both the AUTO and OEM divisions are thoroughly tested at Nissens' own test lab before being released for the markets. The lab has all the facilities needed for testing quality, functionality, and durability. This is verified by measuring key elements such as cooling capacity, pressure strength, thermal strength, vibration resistance, and corrosion resistance. This ensures that all products perform at their best, and comply with given standards and specifications."