After a few years of good service my blow off tube has started to leak (no bubbles in the jar) so i bought a Youngs Super Major Airlock as i had read good reviews, the main problem for me with standard airlocks was not the wine leaving the FV through the airlock it was the drying out as the vigorous fermentation blew all the water out , the main body of the super airlock is huge compared to the Wilko handy airlocks i normally use, the body measures 8 cm x 4 cm and the diameter of the stem is also slightly larger so is a tight fit in the well worn grommet in my FV, it is a 3 part airlock and is silent in operation.