Comparison : Item # 21WH010150ISC, 1-1/2" White Internal Square Cap
Item # 21BL010150ISC, 1-1/2" Black Internal Square Cap
Item # 21WH010150ISL, 1-1/2" White Internal Square Elbow
Item # 21BL010150ISL, 1-1/2" Black Internal Square Elbow
Item # 21WH010150IST, 1-1/2" White Internal Square Tee