The final oil drain mechanism R DIN 42548 is used in transformers starting from 6.3 MVA. The use of the final oil drain mechanism ensures that the residual oil below the drain valve is completely drained. Studs and nuts are made of A2 stainless steel.

Final oil drain mechanism R DIN 42548
Absolutely resistant to 100°C transformer oil
Twice the protection against leakage.
Insensitive to transport effects.
Safe against operating errors protected by blind flange.
Low in space requirement with sufficient flow clearance.