---
product_id: 100896503
title: "Johnson Pump - SPX Flow CART. Aerator Pump 500 GPH STR"
brand: "johnson pump"
price: "€ 182.17"
currency: EUR
in_stock: true
reviews_count: 13
category: "Johnson Pump"
url: https://www.desertcart.es/products/100896503-johnson-pump-spx-flow-cart-aerator-pump-500-gph-str
store_origin: ES
region: Spain
---

# 12V power source 500 GPH max flow rate Easy swap cartridge design Johnson Pump - SPX Flow CART. Aerator Pump 500 GPH STR

**Brand:** johnson pump
**Price:** € 182.17
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your catch alive and your boat dry — the pump pros trust!

## Quick Answers

- **What is this?** Johnson Pump - SPX Flow CART. Aerator Pump 500 GPH STR by johnson pump
- **How much does it cost?** € 182.17 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/100896503-johnson-pump-spx-flow-cart-aerator-pump-500-gph-str)

## Best For

- johnson pump enthusiasts

## Why This Product

- Trusted johnson pump brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Powerful 12V Operation:** Reliable and efficient power for continuous aeration and bilge pumping.
- • **Modular Cartridge Design:** Quick-swap heads and replaceable nipples mean zero downtime and easy maintenance.
- • **Robust 500 GPH Flow Rate:** Keeps your livewell oxygenated and bilge dry with industry-leading water movement.
- • **Saltwater-Proof Durability:** Engineered to withstand harsh marine environments for years of heavy use.
- • **Versatile Mounting Options:** Mount straight down or at 90° to fit your setup perfectly and optimize performance.

## Overview

The Johnson Pump SPX Flow CART Aerator Pump delivers a robust 500 gallons per hour flow powered by a reliable 12V source. Designed with a modular cartridge system, it offers easy maintenance and long-lasting durability, especially in saltwater conditions. Compact and versatile, it supports multiple mounting orientations and is ideal for livewells, bilge pumping, and DIY kayak bait wells.

## Description

Precise production of custom design industrail equipment

Review: Works well, threads are odd though - Needed to replace my aerator pump and I like the easy swap heads on these and use them for my bilge pumps as well. The old aerator screwed onto a 3/4in valve with standard garden hose thread (11.4 threads per inch) but this uses 14 threads per inch so they are incompatible. The screw portion does however fit snugly into a 1in pvc pipe so gluing it in that with a garden hose connector on the end fixed it up nicely.
Review: Terrific livewell pumps - Short version: after "heavy" use in salt water conditions, I love it and would absolutely recommend it. I purchased my first one locally on recommendation of an old salt. It was bad out of the box 😮😳😂 Seller said it's not uncommon, but the same happens with other brands, in higher numbers. He stood by his recommendation and swapped it out no problem. This one was for a DIY kayak bait well. It is not a cheap pump, it is a very well designed pump and this translates to more bang for the buck. Tip: Good level positioning is important to avoid air bubbles. I ran a screened intake with a check valve thru a scupper, kept the intake just above the bottom of the scupper and in this configuration, it does not collect weeds much. With the in-line check valves, no need to be moving to get the pump started (nor extending the intake below the scupper, which collects Sargassum weed and snot/mud when portaging thru inshore flats, no good). Connect to the pump intake, then reduce exit above pump to add an inline squeeze-ball, also with check valve (the basic rubber type). Install a thru wall fitting into the tank, mount 1/8" holes drilled pvc tube as spray bar angled toward the wall to prevent tiring baits with too much current. Also helps aerate, no bubbler needed. Simple overflow screen with flex tube exit. In the hot, calm summer days, I let it drain thru the rear deck scupper and help keep the kayak interior cooler or drape it back over the side . Love the easy swap cartridge design and it comes with option to mount straight down or 90• Ran this on a $40 timer switch, but it didn't hold up long in saltwater. I swapped it for a simple off/on toggle and just run it depending on type, number of baits and water/air temps. Another advantage, the nipples don't easily bust from over tightening (both pumps in a boat we bought had busted nipples, replaced them both with the Johnson 500 gph). But if they did, you can just swap it out with a spare nipple instead of replacing the entire pump. As I'm writing this, I realize how much I really like these pumps. Longevity? In the kayak, 5 days a week 6-16 hours a day 😂 for 3 years without issues other than a plugged intake, simple on the water tape job fix. It's easy to prime the pump by hand, once it's got solid pressure she's good to go for the day.

## Features

- Package length: 10.16 cm
- Package width: 15.24 cm
- Package height: 25.4 cm
- Product Type: FISHING EQUIPMENT

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001F0GOB8 |
| Best Sellers Rank | #200,473 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #213 in Boat Bilge Pumps |
| Brand | Johnson Pump |
| Color | Multicolor |
| Customer Reviews | 4.5 4.5 out of 5 stars (287) |
| Date First Available | June 8, 2005 |
| Global Trade Identification Number | 00729321285032 |
| Item Weight | 15.5 ounces |
| Item model number | 28503 |
| Manufacturer | SPX FLOW US, LLC |
| Manufacturer Part Number | 28503 |
| Material | Canvas |
| Maximum Flow Rate | 8.33 Gallons Per Minute |
| Model | CART. AERATOR PUMP 500 GPH STR |
| Power Source | Ac/dc |
| Product Dimensions | 4"L x 6"W x 10"H |
| Specific Uses For Product | SportingGoods |
| Style | Above Ground |
| UPC | 729321285032 |
| Voltage | 12 Volts |

## Product Details

- **Brand:** Johnson Pump
- **Color:** Multicolor
- **Global Trade Identification Number:** 00729321285032
- **Manufacturer:** SPX FLOW US, LLC
- **Material:** Canvas
- **Maximum Flow Rate:** 8.33 Gallons Per Minute
- **Power Source:** Ac/dc
- **Product Dimensions:** 4"L x 6"W x 10"H
- **Style:** Above Ground
- **Voltage:** 12 Volts

## Images

![Johnson Pump - SPX Flow CART. Aerator Pump 500 GPH STR - Image 1](https://m.media-amazon.com/images/I/51s8Qs3olpL.jpg)

## Questions & Answers

**Q: When using the 28503, does the motor have to be installed straight up or will it work sideways**
A: I don't know.  I did not try any other position but straight up, which was how the original equipment was installed.

**Q: How long is the intake on it**
A: About 6 inches long

**Q: Will the 28503 work sideways**
A: I don't know.  The poly position I tried was straight up, which is how the original equipment was installed.

**Q: can the  pump work if the pump is 2.5 f above the water and the intake hole in water ?**
A: Yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well, threads are odd though
*by R***Z on February 27, 2023*

Needed to replace my aerator pump and I like the easy swap heads on these and use them for my bilge pumps as well. The old aerator screwed onto a 3/4in valve with standard garden hose thread (11.4 threads per inch) but this uses 14 threads per inch so they are incompatible. The screw portion does however fit snugly into a 1in pvc pipe so gluing it in that with a garden hose connector on the end fixed it up nicely.

### ⭐⭐⭐⭐⭐ Terrific livewell pumps
*by W***S on August 31, 2021*

Short version: after "heavy" use in salt water conditions, I love it and would absolutely recommend it. I purchased my first one locally on recommendation of an old salt. It was bad out of the box 😮😳😂 Seller said it's not uncommon, but the same happens with other brands, in higher numbers. He stood by his recommendation and swapped it out no problem. This one was for a DIY kayak bait well. It is not a cheap pump, it is a very well designed pump and this translates to more bang for the buck. Tip: Good level positioning is important to avoid air bubbles. I ran a screened intake with a check valve thru a scupper, kept the intake just above the bottom of the scupper and in this configuration, it does not collect weeds much. With the in-line check valves, no need to be moving to get the pump started (nor extending the intake below the scupper, which collects Sargassum weed and snot/mud when portaging thru inshore flats, no good). Connect to the pump intake, then reduce exit above pump to add an inline squeeze-ball, also with check valve (the basic rubber type). Install a thru wall fitting into the tank, mount 1/8" holes drilled pvc tube as spray bar angled toward the wall to prevent tiring baits with too much current. Also helps aerate, no bubbler needed. Simple overflow screen with flex tube exit. In the hot, calm summer days, I let it drain thru the rear deck scupper and help keep the kayak interior cooler or drape it back over the side . Love the easy swap cartridge design and it comes with option to mount straight down or 90• Ran this on a $40 timer switch, but it didn't hold up long in saltwater. I swapped it for a simple off/on toggle and just run it depending on type, number of baits and water/air temps. Another advantage, the nipples don't easily bust from over tightening (both pumps in a boat we bought had busted nipples, replaced them both with the Johnson 500 gph). But if they did, you can just swap it out with a spare nipple instead of replacing the entire pump. As I'm writing this, I realize how much I really like these pumps. Longevity? In the kayak, 5 days a week 6-16 hours a day 😂 for 3 years without issues other than a plugged intake, simple on the water tape job fix. It's easy to prime the pump by hand, once it's got solid pressure she's good to go for the day.

### ⭐⭐⭐⭐⭐ Fits
*by J***H on July 2, 2025*

Easy to replace

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---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-03-14*