Fiberglass Products

Stainless Steel Couplings

Constructed from stainless steel (recommend for discharge connection). Couplings include gaskets, nuts, bolts, and washers.


  1. Find location where center of coupling will be positioned on basin.
  2. Drill or cut hole in basin to accept outside diameter of the coupling being installed.
  3. Place the coupling on the basin wall and drill mounting holes in basin wall to match coupling plate.
  4. Apply gasket to back of plate and mount on basin.
  5. Insert nuts, bolts, and washers and tighten in place.

Stainless Steel Couplings (PDF)

Features / Specifications

SIZE1 1/4″1 1/2″2″2 1/2″3″4″
B4 3/8″4 3/8″4 3/8″4 3/8″8 1/2″8 1/2″
C2 3/16″2 3/16″2 3/16″2 3/16″5″5″
D3 1/4″3 1/4″3 1/4″3 1/4″6″6″