Capacity : 450 gpm (28.4 L/s)
Head : 30 ft (39.5 m)

Standard (4RH) and Explosion-Proof (4RHX) Construction
The 4RH and 4RHX (Explosion-proof) Submersible Wastewater Pumps are the right choice when difficult to pump fibrous or stringy solids are to be expected. The 4RH/4RHX series provides smooth, vibration-free operation when operating at heads higher than peak efficiency. For use in municipal lift stations, treatment plants and industrial waste applications. Myers offers a complete line of wastewater pumps, lift-out rail assemblies, controls and accessories to meet your needs.

Advantages By Design
Passes stringy trash, fibrous wastes, slurries and other difficult to pump solids that standard enclosed or semi-open impellers cannot.
  • Recessed impeller design has completely open passage in volute.
  • Pumping action is by vortex; solids can't get caught in impeller volute.
  • Operates without vibration or cavitation over entire performance curve. Operates near shut-off without harming pump.
Durable motor will deliver many years of reliable service
  • Recessed impeller greatly increases bearing life by reducing radial load.
  • Oil-filled motor for maximum heat dissipation and constant bearing lubrication.
  • Heat sensor thermostats imbedded in windings protect motor from overheat conditions.
  • Seal leak probes warn of moisture entry; helps prevent costly motor burn-out.
Available with optional FM approval for use in Class 1, Groups C and D hazardous locations (4RHX only).
Unit of Measure



N/A 130 ft39.5 m

Solids Handling

N/A 3 in76 mm

Liquids Handling

N/A Effluent Fiberous Wastewater Raw Unscreened Sewage Storm Water

Intermittent Liquid Temperature

N/A up to 140 ºFup to 60 ºC

Winding Insulation Temperature. (Class H)

N/A 356 ºF180 ºC

Motor Electrical Data

N/A 3450 RPM
7 1/2-15 HP, 200/230/460/575V
3Ø, 60 Hz
20 HP, 230/460/575V
3Ø, 60 Hz

Acceptable pH Range

N/A 6 to 9

Specific Gravity

N/A 0.9 to 1.1


N/A 28 to 35 SSU

Horizontal Discharge Flanged Centerline

N/A 4 in 125 lb. ANSI 101.6 mm


N/A 3450 rpm


N/A 20 hp


N/A 230 V


N/A 3


N/A 60 Hz


N/A 222.8 A88.8 kV·A


N/A 59.5 A19.7 kW16.0 kV·A

NEC Code Letter


Service Factor

N/A 59.5 A19.7 kW1.0


N/A 450 gpm28.4 L/s


N/A Consult factory for applications outside of these recommendations.

Construction Material

Motor Housing Material

N/A Cast Iron, Class 30, ASTM A48

Seal Housing Material

N/A Cast Iron, Class 30, ASTM A48

Volute Case Material

N/A Cast Iron, Class 30, ASTM A48

Cord Cap Material

N/A Cast Iron, Class 30, ASTM A48

Recessed Impeller Material

N/A Ductile Iron, Class 65, ASTM A536

Power Cord Material

N/A 25 ft. SOOW

Control Cord Material

N/A 25 ft. SOOW

Standard Double Tandem Mechanical Seal Material

N/A Carbon & Ceramic, Type 21

Optional Double Tandem Mechanical Seal Material

N/A Lower Tungsten, Carbide

Pump Shaft Material

N/A 416 SST

Motor Shaft Material

N/A 416 SST

Fasteners Material

N/A 300 series SST

Agency Approvals

Agency Approvals