A.Y. McDonald · Effluent Pump
High Head Cast Iron Effluent Pumps, 1/2 to 2 HP
Oil-filled cast iron effluent pumps for long, uphill or pressurized septic runs: heads to 122 ft and flows to 121 GPM.
84-122 ft Max Head · 81-121 GPM Max
1/2-2 HP
115V or 230V 1Ph
Manual (Piggyback Ready)
3/4 in Solids
2 in NPT Discharge
Cast Iron, Oil-Filled Motor
20 ft Cord
69-77 lb Weight
What Ships and What It Needs to Run
Included: the cast iron pump with oil-filled motor and 20 ft quick-disconnect cord.
Float or control panel required, ordered separately. These manual models run from a piggyback float such as the Pumpmaster or Verticalmaster, or a control panel.
Sized at install: pump tank, check valve and discharge pipe.
Overview
These 1/2 to 2 HP high head effluent pumps handle up to 3/4 in solids with a 2 in FNPT discharge, for dewatering, septic systems, residential and commercial developments and elevator pits. Heads reach 124 ft TDH and flows 122 GPM, per the catalog.
Manual or float? Manual models have no switch: they run from a piggyback float switch plugged in behind the pump cord, or from a control panel. The piggyback design means a defective switch can be replaced without replacing the pump.
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Oil-filled PSC motor, class F — upper and lower ball bearings, internal overload on single-phase models.
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Single mechanical seal in an oil-filled chamber; double-seal and seal-failure options from the factory.
- 1 or 2 vane cast iron impeller.
Genuine A.Y. McDonald equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier. Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor.
1-Year A.Y. McDonald Warranty
Covered for 1 year from the date of installation, or 2 years from the date of manufacture, whichever comes first under Baker Manufacturing’s published limited warranty (A.Y. McDonald Pumps & Accessories price list, effective 7/1/26). Per Baker’s terms, the warranty does not cover failure caused by sand or abrasive materials in the water.
Outgrow It and You Don’t Replace It
Models & Ratings (60 Hz)
| Model |
Part No. |
HP |
Volts |
Amps |
Max Head |
Max Flow |
Weight |
| 405011EFS |
6191-014 |
1/2 |
115 |
13.8 |
84 ft |
81 GPM |
74 lb |
| 405012EFS |
6191-015 |
1/2 |
230 |
6.9 |
84 ft |
81 GPM |
69 lb |
| 410012EFS |
6191-016 |
1 |
230 |
10.4 |
115 ft |
90 GPM |
77 lb |
| 415012EFS |
6191-017 |
1-1/2 |
230 |
12 |
107 ft |
110 GPM |
77 lb |
| 420012EFS |
6191-018 |
2 |
230 |
14.8 |
122 ft |
121 GPM |
77 lb |
Source: A.Y. McDonald Pumps by Baker catalog, rev 3/26, and Pumps & Accessories price list, effective 7/1/26.
Performance — Will It Do What You Need?
| Flow, GPM → |
0 |
20 |
40 |
60 |
80 |
100 |
120 |
| A: 405011EFS / 405012EFS |
84 |
69 |
52 |
32 |
11 |
— |
— |
| B: 410012EFS |
115 |
94 |
73 |
52 |
29 |
— |
— |
| C: 415012EFS |
107 |
97 |
86 |
72 |
56 |
38 |
— |
| D: 420012EFS |
122 |
111 |
99 |
86 |
72 |
55 |
14 |
Total head in feet at each flow, digitized from the published curve in the A.Y. McDonald Pumps by Baker catalog, rev 3/26, p. 328, and rounded down. A dash is beyond the end of the published curve.
Before You Buy — The Limits That Decide the Fit
| Water |
Effluent and drainage with up to 3/4 in solids. Not for raw sewage. |
| Head |
84 ft (1/2 HP) to 122 ft (2 HP) at shut-off. |
| Power |
115V (405011EFS) or 230V single phase. |
| Switch |
Manual: a piggyback float or control panel is needed. |
| Temperature |
140°F intermittent. |
| Pairing |
Single pump. |
Materials of Construction
| Discharge |
2 in NPT, vertical |
| Solids |
3/4 in |
| Liquid temperature |
140°F (intermittent) |
| Motor housing, volute, seal plate |
Cast iron |
| Impeller |
Cast iron, 1 or 2 vane |
| Shaft |
Stainless steel |
| Shaft seal |
Single mechanical, carbon / ceramic, Buna-N; tandem double seal optional |
| Bearings |
Single row ball, oil lubricated, upper and lower |
| Hardware |
300 series stainless steel |
| O-rings |
Buna-N |
| Cord |
20 ft standard, sealed-entry quick disconnect; up to 100 ft available |
