Everything 440Source sells gets a bad rap here because its made in China ... doesn't matter that the quality is pretty damn good for the price and that the majority of stuff will easily survive the intended purpose. Likewise with their pump housings. Someone took a look in one and noticed the difference in passage sizes and it went viral from there. Despite a number of people using the housings with absolutely no detrimental affect, the vocal majority prevailed. So if you're 440Source, what do you do? On your next production run you cave to the whining loudmouth schmucks.