SKU: 14006518228

AVG PTR20-850-LF 20mm 850kPa PTR / TPR Pressure Temperature Relief Valve

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Description

AVG PTR20-850-LF 20mm 850kPa PTR / TPR Pressure Temperature Relief ValveOverview Australian Valve Group (AVG) PTR20 850 LF 20mm (3 4") 850kPa PTR Pressure and Temperature Relief Valve (also known as TPR valve) is cross compatible with other popular makes such as Reliance HT55 PTR valve with same fitments and functions. During the hot water services' heating cycles, the volume of water will expand as the temperature increases. This volume expansion creates excessive pressure inside the water cylinder and must be regulated.

Overview

Australian Valve Group (AVG) PTR20-850-LF 20mm (3/4") 850kPa PTR Pressure and Temperature Relief Valve (also known as TPR valve) is cross compatible with other popular makes such as Reliance HT55 PTR valve with same fitments and functions.

During the hot water services' heating cycles, the volume of water will expand as the temperature increases. This volume expansion creates excessive pressure inside the water cylinder and must be regulated. The AVG PTR valve is designed to regulate and relieve the pressure in hot water services by dripping in a controlled manner. 2-5L a day of dripping is normal, depending on the hot water usage and the amount of heating going into the water.

The AVG PTR valve is also a mechanical protection device for the hot water services. In rare occasions of faulty thermostat or heating element, the hot water service can overheat and build dangerously high pressures. When the AVG PTR valve senses this abnormally high temperature and pressure, it will dump large amounts of water in hundreds of liters for an emergency pressure relief.

A functioning PTR valve is a requirement by law in Australia for safety and the AVG PTR  valve is approved under the Watermark standard. The AVG PTR valve comes with an insulation jacket and allows for a professional look and minimal heat loss.

A PTR valve usually has a life span about 5 years and needs replacing if you notice excessive water leakage in a stream instead of a controlled dripping. The AVG PTR valve is cross compatible with many other brands such as Reliance, Tomson, Nefa and Reflex.

The AVG PTR valve fits perfectly with mainstream heat pump, solar, electric and gas storage water heater brands such as Rheem, Vulcan, Rinnal, Dux, Aquamax, Thermann, Apricus and Solahart. 

The 3/4" (20mm) size is mostly commonly used in commercial applications where the larger expansion ratings are required and specified by the local plumbing rules.

For residential hot water services, the 3/4" 20mm thread size will work also. However, a 1/2" (15mm) PTR valve with a reducer fitting is usually used instead for residential applications to save the costs. 

Technical Details

  • Brand: Australian Valve Group (AVG)
  • Model: PTR20-850-LF
  • Watermark License Number: 2639
  • Expansion Rating: 46 kW 
  • Pressure Rating: 850 kPa
  • Temperature Rating: 99°C
  • Thread Size: 3/4" BSP (20mm) Male MI thread and female FI thread
  • Thread Size Physical Measurements: 26.441mm external male and internal female thread diameter (refer to the BSP sizing chart in the photo gallery)
  • Insulation Jacket Included 
  • Material: DR Brass
  • Intended Use: Electric tanks, solar tanks, gas storage tanks and heat pumps
  • SKU: AVG-PTR20-850-LF

Package Contents

  • AVG PTR20-850-LF 20mm (3/4") 850kPa PTR Valve with insulation jacket
  • Package Weight: 500g

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 14006518228

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Cocmcaha
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★★★★★ 5
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Size: 8 Toddler, Color: Navy
My son was having some issues with a store brand shoes, I think his fit may have been a little too wide. It caused him enough pain he would take off his shoes. So I opted to invest in these Stride Rites. He doesn't want to use any other shoes. They are easy to get on, they fit him well. I like the fact that you can take out the inside of your child has wider feet. Instead of buying multiple cheaper shoes I'll just invest in a couple of stride rites if it means I have a happy toddler with happy feet.
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Reviewed in the United States on October 28, 2025
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sharon r
Chelsea, US
★★★★★ 5
Best shoes for little ones!
Size: 6 Toddler, Color: Grey
Good fitting and solid shoes for an active little boy.
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Reviewed in the United States on January 14, 2026
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CSMoss
Lake Worth, US
★★★★★ 1
If only the cosmetic laces would not break and fray.
Size: 6 Toddler, Color: Navy
As in other reviews I saw, the lace (cosmetic) on one broke off from the shoe after only a few times worn and so does not look nice. Frustrating because the shoes are great for walking/running/ playing. 🤷🏼‍♀️
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Reviewed in the United States on May 15, 2026
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So comfortable and breathable.
Charlottesville, US
★★★★★ 4
Great for toddler
Size: 8 Toddler, Color: Grey
My toddler felt these comfortable. He was able to run with support, and material was great. These do not tear easily.
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Reviewed in the United States on December 31, 2025
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Amy PV
Whiting, US
★★★★★ 5
Perfect footwear! Wow...
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Stride Rite deserves all the hype... The best children's shoes we have ever owned. I love the removable insert that lets you measure the foot, or adapt for wide / narrow feet. We took it out just to prevent extra pressure on the bone structure. Basically, I bought one pair of these, and one lower quality brand just for playtime / getting dirty, etc. It was a great setup and it's nice to have two pairs of shoes available. He outgrew these and I got the next size up of the same style. That's a very good sign 👍
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Reviewed in the United States on July 13, 2025

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