with new faucets accessories supplied to screw the instrument are not suitable because they are too short and therefore we must find a suitable extension! I found at surf gde of DIY but only ball with aerator (4 + E) and therefore this is not the top to unscrew if you want to remove it each time .On the other hand, the end caps hard plastic do not have a perfect seal, and I had to put Teflon to remedy the bp! the big advantage is that it's no need to EDF! I find that this device is sold very expensive for very average finishes and if you're not handy .....