A. Not necessarily. All brands of trip wastes can use different lengths of drop cylinders depending on how the drain tee was made by the manufacturer. Unfortunately, the only way to find out if the brand we have will work for your waste and overflow is to install it and test it, which then makes it non-returnable because it has now been used. If you know the brand of drain you have then it's better to purchase that brand of drop cylinder. If you are unable to identify which brand you have and don't want to chance getting the wrong parts you will need to replace the entire drain assembly and start anew.