I am installing a shower drain in my basement floor do I need a p-trap in the line

Hi Reno...

You need a 2" drain pipe, a PTRAP and an 1.5" vent. The Ptrap keeps sewer gasses from entering into your home and a vent is needed to keep the waste water flowing in a "turbulent" and self-scouring manner that keeps the pipes from clogging over time.

The 1.5" vent needs to tie into a vent in the basement or it needs to run upstairs and connect into a vent up there at a minimum of 42" off the finish floor.

Any more questions just let me know...

Mark

Are there any other fixtures neaerby such as a lavatory or a laundry sink? Washer stations don't count> Let me know, Tom