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WATERPROOFING DRAIN SYSTEM
Membrane Clamping Drain
For waterproofing underlayments in concrete slabs. The membrane clamping ring creates a watertight seal around the drainage opening, with primary and secondary weep holes.
Free 2026 floor drain catalog
Every drain, cover and trap, plus the part number guide (PDF). Get the catalog
Every drain, cover and trap, plus the part number guide (PDF). Get the catalog
Standard features
- Top plate
- 12" × 12" square with solid cover
- Setting ring
- 12 GA, 2.5" below top plate
- Outlet sizes
- 3" · 4" · 6" · 8" (2" on request)
- Outlet pipe
- 4" long — Sch 10 or Sch 40
- Sump depth
- 6.25" or 10"
- Traffic rating
- Forklift — 12,500 lbs*
*Heavy traffic in accordance with ASME A112.6.3 standards.
Features
- Built to last a lifetime
- 1/2" thick stainless top plate & cover (std)
- 12 GA body — seamless spun
- Sanitary, non-corrosive & heat resistant
- T304 or 316 stainless (made in USA)
Basket options
Strainer basket
IncludedOur standard dome-shaped T304 perforated basket with center lift handle, included with standard floor drains.
Perforated wall basket
UpgradeHolds more solids. Fits all floor drains except low profile drains.
Slot wall basket
UpgradeUsed primarily for large debris collection.
Drawings & documents
Need a drawing for your submittal? Request a detail drawing →
Pairs well with
P-traps
Cleanouts
Drain basketsProduct specification
CD12-S-PSS4-MR-30412 x 12 x 6.25" deep with Membrane Clamping Ring & Weep Holes, 12 gauge, all type 304 (CF8) stainless steel square industrial floor drain with loose set anti-tilt extra-heavy-duty perimeter drainage cover, 1/2" top plate frame, perforated removable bucket basket with lift handle, pre-sloped bottom sump, and pre-pour concrete stabilizing anchor ring.
Where membrane clamp drains are used
A membrane clamping floor drain is used particularly in waterproofing deck applications. The clamping ring creates a watertight seal around the drainage opening to prevent water from leaking through to the underlying structure or concrete slabs above ground floor level.
We offer a full line of commercial grade custom floor drains.
Related drains
More floor drains
12×12 Industrial Floor Drain
Our best seller. Solid cover, sediment bucket.
12"×12" TOP · T304 / 316L
12×12 Square Top Drain
Seamless spun body, stocked in 3", 4" and 6" outlets.
12"×12" TOP · T304 / 316L
Low-Profile Square Drain
Shallow body for thin slabs and retrofits.
12"×12" TOP · T304 / 316L
Square Deep Sump Drain
Extra sump volume for heavy solids.
12"×12" TOP · T304 / 316L
Need a different size or outlet?
Outlets from 3" to 8" (2" on request), side outlets, locking and sealed covers — built to spec.