Yes, I understand testing method with oil is not final solution.
However, I already inform that to our QC but we no more time wait for the test results.
Please immediately pack 2 pcs of liner DN600/60 NBR and ship out the replacement to us within today for serve order under your cost.
For the rest (3 pcs) ,kindly let us have credit not within this Friday for closed this issue and we will return the liner to you under your cost.
And if we have to delay shipment to customers cause of your replacement of liner doesn’t come to us in time then customer shall let us ship out the whole valves and not only your liner to them by air which we have to back charge you all the airfreight cost (the finish valves) to you.