Little Giant Pumps FAQ: Drain Pumps, M53 Sump Kits, and 2" PVC Hole Saws

I'm not a pump engineer. I'm an office administrator for a 220-person company. I manage facility and MRO ordering—roughly $180,000 annually across 12 vendors. I report to both operations and finance. That means I buy Little Giant pumps for HVAC condensate, loading dock sumps, tenant improvements, and sometimes just to replace a failed unit before an inspection.

Here are the questions I actually get from maintenance techs, property managers, and other admins. Short answers, based on what has worked—and what has cost us time.

• Is Little Giant Pump Co. the same as the Little Giant behind 1950s tool boxes?
• What is a Little Giant drain pump used for?
• What comes in an M53 sump pump kit?
• What size hole saw for 2" PVC pipe?
• How do I size a sump pump for a commercial building?
• Is expedited shipping worth it for a pump?
• What should I check before ordering parts?
• What warranty and support should I expect?

Is Little Giant Pump Co. the same as the Little Giant behind 1950s tool boxes?

Here's the thing: "Little Giant" is a name that has been used by more than one company over the decades. Little Giant Pump Co. is known today for pumps—sump, drain, condensate, sewage, pond, pool cover, and utility models—plus parts and accessories. If you are searching for a 1950s tool box, you are probably looking at a vintage product with its own markings, not a current pump catalog item.

I have seen this confuse people in both directions. A tech once asked me to order a "Little Giant" switch for an old utility pump. The model number on the nameplate would have saved a return. If you typed little-giant with a hyphen and landed on pump listings, that does not mean every vintage Little Giant item is related.

For purchasing, the practical rule is simple: go by the exact model and serial number on the equipment. If it is a pump, use Little Giant Pump Co. specs. If it is a tool box, use the tool box's own brand and era. Do not assume a pump distributor can date or appraise a 1950s tool box.

What is a Little Giant drain pump used for?

A Little Giant drain pump is generally for moving water from a flat surface or small basin where you do not have a deep sump pit. Think HVAC condensate, washing machine discharge, basement seepage, loading dock puddles, or low-level water in a utility room. They are often smaller and more portable than a sump pump.

Choose a drain pump when the water is relatively clean, the lift is modest, and you need to drain an area quickly. Choose a sump pump when water collects in a pit and you need automatic cycling with a float switch. I have used Little Giant drain pumps for a tenant improvement where the floor drain was undersized. It worked fine—though I should note we had fairly standard water volume and no solids.

The mistake I see is buying a drain pump for a dirty sump pit. Solids and debris can clog it. If the water has grit, sewage, or pond sludge, look at a sewage or solids-handling pump instead. Verify the model's solids handling and discharge size before ordering.

What comes in an M53 sump pump kit?

An M53 sump pump kit usually bundles a Little Giant sump pump with a switch, discharge adapter, and sometimes a check valve or basin accessories. The value is not just the price. It is not discovering at 5 p.m. that you are missing the adapter.

If I remember correctly, our last kit included the pump, a vertical switch, and a 1-1/2 in. discharge adapter. But do not quote me on that for every M53 kit. Some kits are pump-plus-switch only. Others include the whole basin. Read the included-items list carefully.

In 2024, we ordered a kit for a tenant improvement and saved about a day of running around for parts. For B2B, I prefer kits because the invoice is cleaner and the parts are matched. That said, "kit" does not always mean everything. If your discharge is 2 in., you may still need a reducer or adapter. Check the pump's discharge size first.

What size hole saw for 2" PVC pipe?

For 2 in. Schedule 40 PVC, the outside diameter is about 2.375 in. According to ASTM D1785, 2-inch PVC pipe dimensions are nominal—meaning the name is not the actual outside size. So the common hole saw for a clean pass-through is 2-1/2 in. That gives you a little clearance.

What size hole saw for 2" PVC if you need room for movement, insulation, or a fitting? Go to 2-5/8 in. or 3 in. A 2-3/8 in. hole saw can work if the run is perfectly straight and short, but it leaves almost no clearance—or rather, it can be too tight once you add glue or a coupling.

The surprise for me was not the pump price. It was how much the hole saw size mattered. We used a 2 in. hole saw once because someone measured the inside diameter. The pipe would not fit. We cracked a tile and lost three hours. Measure the pipe OD. Not the nominal size. And if you are drilling through a load-bearing member, check structural requirements first.

How do I size a sump pump for a commercial building?

Do not size by horsepower alone. Calculate total dynamic head: vertical lift plus friction loss from pipe, fittings, and check valve. Then look at the pump curve. Little Giant publishes flow at different head heights. A 1/3 HP pump may be fine for an 8 ft lift with a short run. A 1/2 HP may be needed for a longer run or higher lift.

For B2B, size to the worst-case storm or failure event, not the average Tuesday. We use a 1/2 HP in our loading dock pit because the discharge run is long and there is a check valve. Also check basin diameter. A basin that is too small cycles too often and shortens pump life.

Float type matters, too. A vertical float works in tight pits. A tethered float is common in larger basins. Diaphragm switches are used in some condensate and low-level applications. Verify the switch type and cord length against your installation. If you are unsure, ask the distributor for a pump curve and a basin sizing guide.

Is expedited shipping worth it for a Little Giant pump?

In an emergency, yes. The rush fee buys certainty, not just speed. In March 2024, we had a mechanical room sump fail before an inspection. We paid $85 extra for next-day delivery on an M53 kit. The alternative was a wet floor and a failed inspection. That inspection affected a $15,000 tenant build-out schedule.

Had two hours to decide. Normally I would get three quotes and compare freight. There was no time. I went with the local distributor that guaranteed morning delivery, even though they were $40 more than an online vendor with a two-day window. In hindsight, I should have kept a spare on the shelf. But with the constraint, certainty was worth more than the savings.

That said, do not let a vendor scare you into rush shipping if the water can wait. If you are doing planned maintenance and the pit is dry, standard freight is fine. Budget for the rush only when a deadline or water damage risk is real.

What should I check before ordering replacement parts or accessories?

Check the nameplate. Model, voltage, phase, switch type, discharge size, cord length, and serial number. Little Giant has many similar-looking pumps. A wrong switch or adapter can turn a 30-minute repair into a week of returns.

I still kick myself for not checking the discharge pipe size before ordering a pump kit. We had to make an extra trip for a 2" PVC fitting. Now I photograph the nameplate and the old part before I order anything. For B2B, keep a simple spreadsheet: location, model, serial, install date, switch type, discharge size.

Also verify whether the part is under warranty. If it is, the distributor may need the original invoice. If you are buying accessories, confirm they are rated for the same environment—indoor, outdoor, or submerged. If you are not sure, call support with the model number. It is faster than guessing.

What warranty and support should I expect from Little Giant?

Little Giant offers limited warranties that vary by model and application. The terms are not universal. For B2B, keep proof of purchase and installation date. Warranty usually covers the pump or part, not labor. So if a pump fails at 2 a.m., you are still paying a tech to swap it.

That is why I budget for a spare on critical systems. Customer support can help identify replacement parts if you give them the model and serial. In my experience, they are more helpful when you have the nameplate information ready. Do not expect any manufacturer to guarantee performance for every installation. No pump brand can do that.

Verify current warranty terms with Little Giant or your distributor before you buy. Prices and terms change. For reference, common Little Giant sump pump kits have listed around $150 to $350 from industrial distributors based on quotes we received in January 2025—verify current pricing. That range depends on HP, switch type, and whether it is a kit or pump only.