ROBINAIR · There was oil leakage from oil gauge of vacuum pump made by Robinia, gauge broke down when the gauge was removed. Even if I inquired Tasco, I was told that I do not know by model unknown, we were considering replacing the pump, but since the gauge hole of the pump was 20 Φ, I thought it would be profitable if installed. Although it was a bit tricky, I filled with oil and inserted. The pump was perfectly restored. I will also tell them.