The 3" ABS KERDI-DRAIN flange kit — the complete drain body for new shower installations where the drain rough-in is 3" ABS pipe. The larger outlet moves more water, the ABS construction connects directly to ABS pipe with solvent cement, and the fleece-covered bonding flange integrates with KERDI and DITRA waterproofing membranes the same way all KERDI-DRAIN flanges do.

If your plumber roughed in 3" ABS (common in older Canadian construction and some newer builds), this is the drain body that fits. Don't try to adapt a 2" drain to a 3" rough-in — use the right fitting from the start.

What's in the box

• KERDI-DRAIN body — 3" ABS vertical outlet with fleece-covered bonding flange
• Height adjustment collar
• Lateral adjustment ring
• Assembly hardware

Key specs

• Body: ABS plastic with fleece-covered bonding flange
• Outlet: 3" ABS (solvent cement connection)
• Bonding: Fleece embedded in thin-set mortar — same as all KERDI-DRAIN plastic bodies
• Compatible grates: All 4" KERDI-DRAIN grate assemblies (Classic, Contour, Trendline, Tileable)
• 10-year limited warranty

When to use 3" vs. 2"

• Use 3" when your rough-in is 3" pipe, when local code requires 3" drain, or in commercial/high-flow applications
• Use 2" for standard residential bathroom construction — handles typical shower flow without issue and is the more common size

ABS vs. PVC vs. Stainless

• ABS (this product): For ABS pipe rough-ins. Solvent cement, direct connection.
• PVC: For PVC pipe rough-ins. Same flange design, different outlet chemistry.
• Stainless steel: No-hub coupling — works with both ABS and PVC. Better for renovations where pipe material is uncertain.

Pro tips

• Identify your rough-in pipe material before ordering. ABS is black; PVC is white (usually). Using ABS cement on PVC or vice versa creates a weak joint.
• Dry-fit before cementing. Once solvent-cemented, you can't adjust the pipe connection. Use the height collar to fine-tune after the fact.
• Overlap the KERDI membrane at least 2" onto the fleece bonding flange and embed it in thin-set mortar. This overlap is where the waterproofing connection happens — it's not decorative, it's structural.
• The lateral adjustment ring is your friend. After you set the drain in mortar, you have a short window to shift it slightly for perfect centering in your shower tray or mortar bed.

Pairs with: Any 4" KERDI-DRAIN grate assembly (ordered separately), KERDI or DITRA membranes, KERDI-SHOWER pre-sloped trays.