Choosing Compatible Fittings for Above Ground & In-Ground Pool Pumps

Visual Guide to Common Pump Fittings

The image below shows a variety of commonly used pump fittings, adapters, unions, and valves. These components are used to connect pumps to hoses, filters, and plumbing systems, depending on your setup. Use this guide to help identify the parts you need for your setup.  You can search for the SKU # listed on our site at www.Doheny.com

You may need one or more of these fittings depending on your pump type, plumbing size, and connection style. 

Understanding Pool Pump Connections

Pool pumps connect to your system using either threaded ports, slip (glue-in) connections, or hose fittings.

• In-ground pumps: Typically use 1½" or 2" threaded ports designed for rigid PVC plumbing.
• Above ground pumps: Often use flexible hose connections, threaded adapters, or a combination of both.

Because plumbing sizes can vary, it’s very common to use adapter or reducer fittings to create a proper connection.

👉 Browse compatible options here:
In-Ground Pump Fittings & Adapters 

👉 For general replacement fittings and accessories:
Replacement Pool Pump Fittings 

Common Types of Pump Fittings

Understanding the different fitting types will help you choose the correct setup:

• Unions: Allow easy disconnection of the pump for maintenance or winterizing.
• Slip fittings: Designed for PVC pipe and require primer and glue.
• Threaded adapters: Screw directly into pump ports for a secure connection.
• Hose adapters: Used to connect flexible pool hoses (common for above ground pools).
• Reducer bushings: Used to transition between different pipe sizes (e.g., 2" to 1½").
• Valves: Help control or shut off water flow during maintenance.

Many pool setups use a combination of these fittings to create a complete connection between the pump and filter system.

How to Choose the Right Fittings

To select the correct fittings for your pool pump, follow these steps:

1. Identify your pump ports (threaded or slip connection).
2. Determine your plumbing type (PVC pipe or flexible hose).
3. Measure your pipe or hose size (typically 1½" or 2").
4. Select adapters or reducers if your pump and plumbing sizes do not match.
5. Choose unions if you want easier future removal of the pump.

Installation Tips for Pump Fittings

• Use thread sealant or Teflon tape on threaded fittings to prevent leaks.
• Use PVC primer and cement for slip (glue-in) fittings.
• Secure hose connections with clamps on above ground systems.
• Avoid overtightening fittings, which can damage threads or the pump housing.
• Ensure all connections are aligned properly before tightening.

Taking the time to properly install fittings helps prevent leaks and ensures long-term system performance.

Need Help Choosing the Right Fittings?

Providing your pump model, plumbing size, and a photo of your setup can help us recommend the correct fittings quickly.