Rostock Bowden (hotend) Push-Fit Connector

My bowden tube came loose one too many times so I finally bought some push fit connectors from Grainger. I used a 4mm od 1/8 thread. The hotend connector is threaded and was a nice fit.

Push fit connector part# KQ2H04-01AS
Grainger url: http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=36w998&op=search&Ntt=36w998&N=0&GlobalSearch=true&sst=subset