This part is a Set of (5) Bell Reducers, 1-1/2" Slip x 1/2" Slip... You glue a 1 1/2" Pipe that would measure about 1 7/8" OD in the large end and glue a 1/2" pipe that would measure about 3/4" OD in...
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The RENU Kit is a 1" x 3/4" - 3/4" Wye with reducer bushings 1" to 3/4" and 3/4" to 1/2" Along with related parts to make RENU Con