A-LNADJ Thunderbird Products Linear Shower Drain Height AdjusterHeight adjuster for linear shower drain base / body. Can be used with any drain body with 2" NPST (National Pipe Smooth Thread) pattern. Provides 3/8" - 1.5" height adjustment. Multiple height adjusters can be threaded together to provide greater adjustment.Height Adjuster for Linear Shower Drain base/bodyCan be used with any drain body with 2" NPST (National Pipe Smooth Thread) patternProvides 3/8" - 1.5" height adjustmentMultiple height adjusters can be threaded together to provide greater adjustment