---
product_id: 93884573
title: "WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402"
brand: "watts"
price: "R3227"
currency: ZAR
in_stock: false
reviews_count: 13
url: https://www.desertcart.co.za/products/93884573-watts-water-technologies-gidds-1030402-watts-potable-water-expansion-tank
store_origin: ZA
region: South Africa
---

# 4.5 Gallon Capacity 3/4-inch Stainless Steel Nipple 150 psi Max Pressure WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402

**Brand:** watts
**Price:** R3227
**Availability:** ❌ Out of Stock

## Summary

> 💧 Keep your water system pressure-perfect and stress-free with Watts’ powerhouse expansion tank!

## Quick Answers

- **What is this?** WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 by watts
- **How much does it cost?** R3227 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/93884573-watts-water-technologies-gidds-1030402-watts-potable-water-expansion-tank)

## Best For

- watts enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Installation:** Pre-charged and designed for direct mounting to supply piping—get up and running in no time.
- • **Generous 4.5 Gallon Volume:** Handles thermal expansion with ease, reducing system stress and extending equipment life.
- • **Lead-Free & Certified Safe:** IAPMO listed and ANSI/NSF 61 certified for potable water safety and peace of mind.
- • **Premium Stainless Steel Nipple:** Ensures corrosion resistance and seamless integration with your existing plumbing.
- • **Robust 150 psi Pressure Rating:** Built to withstand high-pressure environments for reliable, long-term performance.

## Overview

The Watts Potable Water Expansion Tank Model PLT-12 features a 4.5-gallon capacity with a durable carbon steel body and stainless steel nipple, designed to control thermal expansion in potable water systems. Certified lead-free and rated for pressures up to 150 psi, it supports all direct-fired hot water heaters and storage tanks. Pre-charged and easy to install, it ensures long-lasting, maintenance-free performance for both residential and commercial applications.

## Description

Product Description WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 From the Manufacturer Series PLT Potable Water Expansion Tanks are designed to absorb the increased volume of water created by thermal expansion and to maintain balanced pressure throughout the potable water supply system. Series PLT tanks feature a pre-pressurized steel tank with an expansion membrane that prevents contact of the water with the air in the tank. This prevents loss of air to the water and ensures long and trouble-free life for the system. These tanks may be used with all types of Direct Fired Hot Water Heaters (gas, oil or electric) and hot water storage tanks. IAPMO listed and ANSI/NSF 61 certified. Maximum Pressure: 150psi (10 bar)

Review: Perfect Fit and Replacement. Watts is what you need!! - Perfect Fit and replacement. Purchased the EXT-30 to replace my failed Flextrol expansion tank purchased 12/2020. Apparently the bladder failed, causing my hydronic heating system to increase pressure causing the pressure pop off valve to drip. The old tank was small, 2.1 gallon size. When researching replacements, I accidently ordered the 4.5 gallon. Thankfully it just barely fit. I have three zones and fingers crossed the larger capacity will endure less stress during the repeating thermo cycling. Watts tank is well built, came pre charged at 12 psi. Spun right on 1/2 mnpt connection. Ordered on Monday, delivered Wednesday and 30 minutes later was installed. Pressures have maintained, no leaks, and zero worries. Btw, I called the plumbing supply store where I purchased the Flextrol in 2020, I believe it was less than 100 bucks, wanted a whopping $150.
Review: Better pricing - Easy to install. Better pricing than from the Big Box store. Good quality.

## Features

- WATER EXPANSION TANK: With a generous 4.5 tank gallon volume, the Watts Potable Water Expansion Tank is designed for use in commercial and residential water heating systems to control the thermal expansion of hot water and maintain safe pressures.
- VERSATILE MOUNTING: This potable water expansion tank is designed for easy installation, mounting directly to the supply piping. It features a 3/4-inch male connection and a stainless steel inlet.
- DURABLE CONSTRUCTION: This tank is constructed from high-quality carbon steel with an epoxy finish, ensuring long-lasting performance. It is also equipped with a durable expansion membrane that minimizes the loss of the air charge.
- COMPATIBILITY: These tanks may be used with all types of Direct Fired Hot Water Heaters (gas, oil or electric) and hot water storage tanks. Comes with a maximum pressure of 150psi (10 bar).
- EVERY DROP COUNTS: Water. It's in our name and close to our hearts. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002JEQGYO |
| Date First Available | January 29, 2009 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8.68 pounds |
| Item model number | PLT-12 |
| Manufacturer | Wilo |
| Product Dimensions | 10.5 x 10.5 x 13.5 inches |

## Product Details

- **Brand:** Watts
- **Color:** Gray
- **Material:** Stainless Steel
- **Product Dimensions:** 8"L x 8"W x 11"H
- **Capacity:** 2.1 Gallons

## Images

![WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 - Image 1](https://m.media-amazon.com/images/I/211oLJASjaL.jpg)
![WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 - Image 2](https://m.media-amazon.com/images/I/31Cs-t1kA9L.jpg)
![WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 - Image 3](https://m.media-amazon.com/images/I/31MW39olmtL.jpg)
![WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 - Image 4](https://m.media-amazon.com/images/I/31SUnjagDQL.jpg)
![WATTS WATER TECHNOLOGIES GIDDS-1030402 Watts Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple, 4.5 Gallon, Lead Free - 1030402 - Image 5](https://m.media-amazon.com/images/I/31du1ve1RML.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: if this tank comes recharged at 20 psi can I add air too it if needed? the watts I have now is recharged at 40 but is bad now**
A: Yes air can be added. There is a valve stem at the bottom of the tank. As I recall, I brought the pressure up to 40 lbs. I checked out their website to see what I use for my well pump switch that runs 40 to 60 lbs.

**Q: What is the connection size?**
A: The fitting connection is 3/4" NPT threads.

**Q: This tank will be used on an rv, do any of the tank suppliers offer either a wall mount or cradle type floor mount for the heavier tanks? thanks, ray**
A: Hi Ray, I purchased the same expansion tank, and mounted it on my wall. The bracket I used was called Hydro Claw, by storm king. Its not cheap at about $35 to $40, but it is a well made, heavy duty bracket. Very nice looking install. Even my plumber buddies are very impressed! Highly recomend. Good luck, and stay safe.
Jeff H.

**Q: Rv parks pressure varies. have my incoming pressure set at 40psi. but when using the pump, it comes on at 35psi, & off at 60psi. is this a fit 4 us?**
A: May be helpful, but the pump run pressure range of 15psi is probably normal

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect Fit and Replacement. Watts is what you need!!
*by W**** on March 8, 2025*

Perfect Fit and replacement. Purchased the EXT-30 to replace my failed Flextrol expansion tank purchased 12/2020. Apparently the bladder failed, causing my hydronic heating system to increase pressure causing the pressure pop off valve to drip. The old tank was small, 2.1 gallon size. When researching replacements, I accidently ordered the 4.5 gallon. Thankfully it just barely fit. I have three zones and fingers crossed the larger capacity will endure less stress during the repeating thermo cycling. Watts tank is well built, came pre charged at 12 psi. Spun right on 1/2 mnpt connection. Ordered on Monday, delivered Wednesday and 30 minutes later was installed. Pressures have maintained, no leaks, and zero worries. Btw, I called the plumbing supply store where I purchased the Flextrol in 2020, I believe it was less than 100 bucks, wanted a whopping $150.

### ⭐⭐⭐⭐⭐ Better pricing
*by P***N on August 14, 2025*

Easy to install. Better pricing than from the Big Box store. Good quality.

### ⭐⭐⭐⭐⭐ Worked Just Fine!
*by K***T on December 20, 2025*

OEM. Worked Just Fine!

## Frequently Bought Together

- Watts PLT-5 - 2.1-Gallon Potable Water Expansion Tank, 3/4" Male Connection w/ Stainless Steel Inlet, Steel, Butyl Diaphragm, Maximum Pressure 150 psi
- Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent
- Watts 0342691 30 PSI Pressure Relief Valve, Bronze, 3/4" 335 M2-030

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-03*