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Sanitary Drain Fixed Air Gaps
Sanitary Drain Fixed Air GapsSanitary Drain Fixed Air Gaps
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Sanitary Drain Fixed Air Gaps

Figure Number:  3950-3951
With Threaded Outlet
Product Function:
When installed between the fixture waste outlet and the plumbing drainage system, SMITH Fixed Air Gaps provide protection of fixtures such as food processing equipment, kitchen fixtures, storage tanks, etc., from contamination due to back flow in the drain line. (Air Gap fittings in plumbing waste lines are installed on the house side of the fixture trap.) SMITH Fixed Air Gaps when installed in the water supply to a fixture or appliance, such as evaporative coolers, sterilizers, etc., will prevent contamination from cross connection between the potable water supply and the fixture that handles a contaminating liquid or one that is connected to a plumbing waste line. Local codes should be checked.

Regularly Furnished:
Duco Cast Iron
Related Figure Numbers
  • 3955 - With NO-HUB or Spigot Outlet
NameDescriptionFile Size
Specifications US Govt ComplianceItems complying with U.S. government specifications34 KBDownload
CSI Specifications for Sanitary Floor DrainsCSI Specifications for Sanitary Floor Drains327 KB
FIXED AIR GAP

Smith No. 3950 or 3955 cast iron fixed air gap.

NameDescriptionFile Size
Parts Order Guide for Sanitary Floor Drains1222 KBView

Optional Materials

  • Cast Bronze -CB
  • Chrome Plated -CP - Bronze
  • Chrome Plated Cast Iron -CPCI