3/8" OD x 3/8" OD x 1/4" OD tubing T spliter (reducing tee) with QC. Allow using 1/4" RO tubing on 3/8" OD RO line. Uses in water filters or Reverse Osmosis Systems 3/8"x3/8"x1/4" Quick connect Reducing Tee. If you need to reduce 3/8" OD tubing to 1/4" OD RO tubing Comes with c rings