There are several variations when it comes to choosing a bathtub drain assembly, based on type of material, pipe assembly method and drain stopper type.
Tub drain assemblies are commonly made from one of three different pipe materials: brass, ABS (acrylonitrile butadiene styrene) plastic, or PVC (polyvinyl chloride plastic).
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PVC (polyvinyl chloride) plastic pipe for drains is lighter and often thinner than ABS, and also thinner than the PVC used for pressurized water supply pipes. Special PVC glue is required for glued fittings—ABS glue and PVC glue are not interchangeable. Universal solvents that claim to be suitable for all types of plastic are available but do not bond as well as solvent glues designed specifically for one type of plastic.
PVC is the now plastic drain pipe of choice for most professional plumbers.
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Solvent-glued joints can be used for ABS and PVC pipe. Glued joints offer smooth inner surfaces to the pipes, so they may drain slightly better than with slip fittings. And glued tub drains may be a bit longer-lasting because of the schedule (thickness) of the pipe. Also, when snaking the tub, there may be less chance of breaking a glued joint.Continue to 5 of 6 below.
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Slip joint tub drains can be used in all three pipe types, and they are the only option for a brass pipe. To use slip joint nuts and washers, the waste-and-overflow tube has to be accessible, either through an access panel behind the tub or from under the tub. Slip joints are the easiest to install because they allow for quick adjustments and require no chemical glues.
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You also have options for different stopper types, including trip lever, toe-touch, and push/pull, among others. That choice is simply a matter of personal preference and availability. However, stopper types that have internal linkage operated by a lever may be more susceptible to hair clogs. Spring-loaded toe-touch and push/pull types tend to be more trouble-free.