Detailed Basepump installation instructions


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Basepump® Installation:

These are GENERAL drawings to illustrate basic, typical installations. Basepump is easily adapted to almost any application including longer discharge runs, offset suction pipes, low ceilings, sealed radon covers, under staircases, in closets and crawl spaces, etc. It is not limited to the simplified drawings here; if we tried to present every possibility, we'd have hundreds of sketches and too much confusion. Call or email us if you have questions.

Basepump Outdoor Install Drawing Basepump Indoor Install Drawing

Watch Video of an Installation:

Here we have a professional plumber installing a standard Basepump Model RB750. This is a typical Outdoor Discharge Installation that connects to the underground storm drain shared by the gutter downspout and primary sump pump. It is pretty self-explanatory.

Can I save money by doing it myself? How do I know if this is a project I can tackle?

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Basepump Suction and Discharge Options - Some Common Examples of Installations

Under Joist Discharge

Basepump Under Joist Discharge Drawing

Basepump mounted underneath ceiling joist with flexible discharge hose sloping upward and out through exterior wall.

Perpendicular Discharge

Basepump Perpendicular Discharge Drawing

Basepump mounted perpendicular to ceiling joist, discharged at right angle from pump through hole in joist to exterior.

Suction Pipe Installation Options

Basepump suction options from the sump to the pump

These are 4 typical sumps drawn here. Each one shows the suction pipe from the Basepump in a different way. From left to right:

  1. is offset using 45 degree elbows
  2. is offset using 90 degree elbows; the horizontal length may be up to 10 feet across
  3. is straight up and down
  4. is straight up and down through a Radon Gas sealed cover. 
This shows how simple it is to clear obstacles or to make installation easier. The pump may be installed up to 10 feet away horizontally from the sump, because there may be stairs, heating ducts, electrical panels, cabinets, shelves, windows, or whatever, in the way.

Indoor Discharge

  • In some cases, it may be necessary to connect the discharge from Basepump to the existing discharge pipe from your main sump pump.
  • The suction pipe remains as a separate pipe, but the discharges run out together. The drawings below illustrate how this can be done:
Basepump Indoor Discharge with Hose Sketch
Basepump Indoor Discharge without Hose

Always make certain that there is a good, working check valve in the main pump discharge somewhere below the tee-in point that you are creating here. Otherwise, Basepump will send city water down through the main pump and flood the basement.

Install with AVB Backflow Preventer

Basepump with AVB Installation Drawing

Note: When using the - AVB add-on, the discharges must not be connected together indoors.

The discharge for Basepump in this application must be self-draining to the exterior. Any connection to a drain outside MUST have an air gap to prevent blockage or back siphon to occur, rendering the AVB inoperable. See Back-flow Prevention.

Basepump Water Main Connection Inserted Before Pressure Regulator


Important! Pre-Qualify Your System

Pre-Installation 4 Point Checklist

Before installing, use this handy checklist to verify each item below. Improper installation will result in reduced pumping capacity or pump may not operate at all. Each pump model has slightly different requirements so take note of each model number and the information associated with it.

1. Household Water Pressure

Minimum: 40 lbs. PSI
Maximum: 90 lbs. PSI

Compensate for normal pressure loss from test point to Basepump location. Avoid excessive piping from "tee-in" location, whenever possible. If incoming municipal water pressures exceed 90 lbs. PSI, then it is necessary to "tee-in" after the Pressure Regulator Valve (PRV) to protect the pump valve from damage.

2. Household Water Flow – Extremely Important, DO NOT SKIP THIS TEST

You must be able to fill a bucket with five gallons of water from an outside hose spigot at the following rates:

RB750: 40 seconds or less
HB1000: 30 seconds or less
CB1500: 20 seconds or less

If it takes longer, you may have a restriction that must be bypassed or removed to maximize pumping capacity. If your reading is on the border of these numbers, you may select either one. Keep in mind that you can always get the smaller one, but not always the larger one. Example: you get a reading of 30 seconds. You may choose either the RB750 OR the HB1000. The RB750 will run at the higher end of its range 850-900 GPH, but the HB1000 will run at the lower end of its range 950-1000 GPH. The difference may be very small between them. "Frost-Free" spigots restrict flow by about 30% so adjust the time you measure by reducing it by 30% after you fill the bucket. (e.g. A 40 second "frost-free time" would adjust to 28 seconds "regular spigot time"), allowing us to use the same chart for both types.

3. Type of Piping

RB750: 1/2" or 3/4" Pipe
HB1000: 3/4" Pipe
CB1500: 3/4" or 1" Pipe

Must be installed using copper, CPVC, OR PEX pipe (check local codes if unsure) in the sizes indicated below. DO NOT connect to or install using galvanized iron pipe. The smaller Inside Diameter and the potential for rust and debris to break loose could hinder pump from operating properly.

Pipeline Restrictions

No Restrictions

Basepump must be teed-in before any devices that restrict water flow. Examples of such devices are: stop & waste valves, globe-type valves, pressure regulator valves (PRV), water conditioners, filters, etc. Water meter must be minimum 3/4" standard (usually marked as 5/8"). A Dual Check Valve or an SVB (Spill-Resistant Vacuum Breaker) Backflow device installed in the water supply line before Basepump is often required and should pose no problem. The more flow-restrictive, Reduced Pressure Zone (RPZ) devices will often prevent Basepump from operating. We offer backflow devices in two versions as optional equipment. One is a dual check valve and the other is a built-in AVB device. If you are unsure if you need one, take a look first and then contact your local plumbing department if you have any further questions. Refer back to point #1 if incoming pressures exceed 90 lbs. PSI

General Information

This is NOT a complete instruction manual. It is an overview of the most important details to help you determine if Basepump is the right fit for your application. Complete instructions are included with your pump.

Please READ all the instructions that come with the product BEFORE attempting to install Basepump. The average pumping capacity of Basepump may vary depending on your municipal water supply, pressure, and any restrictions that may exist in your piping. DO NOT connect Basepump BEFORE the Water Meter. This is stealing water and is a crime. DO NOT OVER TIGHTEN FITTINGS WHEN CONNECTING TO BASEPUMP!! DO NOT APPLY HEAT DIRECTLY TO BASEPUMP!! MAKE COPPER CONNECTIONS SEPARATELY AND THEN THREAD THEM INTO BASEPUMP AFTER THEY COOL! Damage to the pump unit can occur if this is ignored and will VOID THE WARRANTY!! Ask your plumber about adding a shut-off valve right after the Basepump Tee-in point so you would be able to turn off the water to the rest of the house and leave Basepump operational; GREAT FOR VACATIONERS.

Additional parts or supplies needed:

  • RB750 can be installed using 1/2" or 3/4" copper pipe or equivalent; 1" PVC Suction & Discharge pipe
  • HB1000 is installed using 3/4" copper pipe or equivalent; 1-1/4" PVC Suction & Discharge pipe
  • CB1500 can be installed using 3/4" or 1" copper pipe or equivalent; 1-1/2" Suction & Discharge pipe.

The following pipe and fittings are typically used in the installation process. Your application may be different than this, so you must plan accordingly.

  • Copper (or equivalent) pipe and fittings, usually a tee, a couple 90 Degree elbows, and enough pipe to connect your existing water supply to the inlet fitting of Basepump.
  • Full Flow "Ball" or "Gate" Valve.
  • Union fitting
  • Dual check valve or Atmospheric Vacuum Breaker to prevent back-flow into the potable water supply may be needed. Check with your local Plumbing Department to be sure.
  • Female adapter to connect to 3/4" threaded male fitting on Basepump.
  • Clear PVC cement and pipe thread sealant tape or paste.
  • PVC pipe for the suction line in the proper size for your pump model and enough to fit your application.


Take a look at one of our easy-to-use, No-Sweat Installation Kits. These kits come in 1/2" and 3/4" sizes and are easy to use with either copper, PEX, or CPVC piping systems. They can even be used to convert from your existing copper to the newer PEX systems without special adapters. You get everything you need for most typical installations, except the pipe itself. That can be purchased locally in either rigid or flexible form. Note: RB750-EZ and HB1000-PRO both include these items in the box. Click here for price information or to order your kit today.

Tools Needed:

  • Power drill with screwdriver bits.
  • Hole saw attachment is needed for outdoor discharge installations. Hole saw size for each pump: (RB750: 1-1/2" HB1000: 1-3/4" CB1500: 2" ).
  • Phillips and Slotted Screwdrivers.
  • PVC cutter or saw, Utility Knife and Tape Measure.
  • Plumbing tools for the water supply pipe you are using.

Product Specifications

  • Materials: Heavy-duty Schedule 80 Polypropylene, Stainless steel hardware, PVC fittings
  • Dimensions without check valve: RB750: L: 16"; W: 4"; H: 6"; Wt: 1.5 lb. HB1000: L: 16"; W: 4"; H: 7"; Wt: 2 lbs. CB1500: L: 18" W: 4"; H: 9"; Wt: 4 lbs.
  • Water inlet fitting: RB750 & HB1000 - 3/4" Female; CB1500 - 1" Female. Male nipples & reducers included.
  • PVC Suction and Discharge openings: RB750- 1" Socket; HB1000: 1-1/4" Socket; CB1500- 1-1/2" Socket)
  • Water service requirements: Minimum pressure: 40 PSI Maximum pressure: 90 PSI
  • Water Flow minimum rate required: RB750- 7GPM; HB1000- 10 GPM; CB1500- 15 GPM


  • RB750 $198.00 
  • RB750-EZ $279.00
  • HB1000 $289.00
  • HB1000-PRO $359.00
  • HB1000-PRO-V $379.00
  • CB1500 $395.00

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Basepump Compact Float for Really Small Sumps

The Compact Float Ball measures 2 Inches wide by 3.5 Inches in diameter, for a slimmer operating "footprint" than the Standard Float Ball, which measures 4.5 Inches in diameter and fits most standard sumps. Note: because of its slimmer profile, it is less buoyant than the standard ball. Water must rise further up onto the ball before it lifts to operate the pump. Position the float mechanism accordingly.

When you upgrade to the Basepump Compact Float at the same time that you buy a complete pump, you will receive the Compact Float assembly in addition to the Standard Float. You then simply remove one screw to substitute the compact float ball for the standard one.

If you order the Compact Float later to be shipped alone, you will only receive the Compact Float Ball and extension arm which you can then substitute for the Standard Float Ball yourself. The float mechanism itself is the same for both styles.

Basepump Compact Float vs Standard Float on an Angle Labeled

Basepump Compact Float vs Standard Float- End View

Basepump Compact Float in 5 Gallon Bucket with Primary Sump Pump

Basepump Compact Float Model:

  • BCF $19.00

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