• Non-clogging vortex impeller design, Cast Iron (180 series), Bronze (190 Series)
• Enclosed impeller design (model 191, 60 Hz only)
• Float-operated, submersible, 2-pole mechanical switch
• Durable, cast iron construction
• Cast iron switch case, base, motor and pump housing
• No sheet metal parts to rust or corrode
• Stainless steel screws, bolts, float rod, handle, guard, arm and seal assembly
• Oil-filled, hermetically-sealed, automatic reset thermal overload protection (1 Ph only)
• Maximum temperature for effluent or dewatering: 130 °F (54 °C), WD189 (60 Hz): 120 °F (49 °C)
• Variable level control systems available
• Neoprene square ring and gasket
• Stainless steel carbon and ceramic rotary shaft seal
• SAE 1117 carbon steel motor shaft (single seal only)
• Upper and lower ball bearing running in bath of oil
• All 180/4180 series pumps pass 3/4” (19 mm) spherical solids.
• Model 191 passes 5/8” (16 mm) spherical solids.
• On point: 14-3/4” (37.5 cm)
• Off point: 5-1/4” (12.7 cm)
• Major width: 12-3/4″ (32.4 cm) (single seal pumps)
• Major height: 19-5/16″ (49.1 cm) (single seal pumps)
• 1-1/2” NPT discharge with 2” or 3” flange available
• Model 191 not available with 3” flange
• Corrosion-resistant, powder coated epoxy finish
• Automatic units not recommended for use in effluent systems
• 1 year limited warranty

Models 4185, 4186, 4188, 4189 Double Seal Pumps (60 Hz, non-automatic only):

• Protects motor from seal leaks
• Improved bearing lubrication
• Helps eliminate seal and bearing damage from dry runs
• 416 stainless steel motor shaft
• Major width: 12-3/4″ (32.4 cm)
• Major height: 21-3/16″ (53.8 cm)

Notes

Note: The sizing of effluent systems normally requires variable level float(s) controls and properly sized basins to achieve required pumping cycles or dosing timers with non-automatic pumps.

Note: No UL listing for 200/208 V, 1 Ph pumps, models 186 & 191, or double seal series. See charts for UL & CSA listings.

Reserve Powered Design.
For unusual conditions a reserve safety factor is engineered into the design of every Zoeller^® pump.