Has anybody information on Impco converters. We no longer see model J or K here in the UK. They were replaced some time ogo with "Cobra." I understand because of an accident in Germany, where an operator pressed the tester/cold start on the secondary chamber for too long causing and engine explosion. There must have been more to the storey than that! Because the Filter Lock valve should stop such occurances. We have seen the button shrouded on some Converters but not on others. Also if you buy a new "Cobra" Converter the button has now been removed. I have not seen that on new production FLT's yet. What are the rules on this button and its shroud now in the US? Impco training information is very hard to come buy here in the UK. Any body know where I can get it?