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  • 2 Gallon Accumulator Tank With Wall Mount Bracket 1/2" Female NPT
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2 Gallon Accumulator Tank With Wall Mount Bracket 1/2" Female NPT

4.7 out of 5 stars 268 ratings

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Brand Pro Water Parts
Material Stainless Steel
Capacity 2 gallons
Included components Wall Mount Brackets
Installation type Under Sink
Purification method Reverse Osmosis
Power source Corded Electric
Item weight 5.3 Pounds
Supported Water TDS Level Maximum (PPM) 20
UPC 035127293011

Product details

  • Product Dimensions ‏ : ‎ 30.48 x 22.86 x 17.78 cm; 2.4 kg
  • Date First Available ‏ : ‎ Aug. 5 2014
  • Manufacturer ‏ : ‎ Pro Water Parts
  • ASIN ‏ : ‎ B00IRFW38W
  • Item model number ‏ : ‎ 1ET2G12F
  • 鶹 Rank: #95,678 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
  • Customer Reviews:
    4.7 out of 5 stars 268 ratings
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Product description

2 Gallon Reverse Osmosis expansion storage tank with custom wall mounting brackets included. Thread 1/2" Female NPT Lead Free Applications: Domestic Portable Water Expansion Tanks are used on gas, oil, or electric, direct-fired, residential water heater and water storage tank applications to absorb the increased volume of water created by thermal expansion. It also maintains balanced pressure throughout the water supply system by keeping system pressure below the T&P relief valve setting. It is a pre-pressurized, field-adjustable steel tank with an FDA-approved rubber diaphragm, and Stainless Steel 1/2 inch Female NPT inlet connection. An expansion membrane prevents air-to-water contact in the tank ensuring a long system life. IAMPO listed and ANSI/NSF 61 certified. Wall Mountable, Custom Brackets included.

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Customer reviews

4.7 out of 5 stars
268 global ratings

Review this product

Share your thoughts with other customers

Top reviews from Canada

  • Reviewed in Canada on July 1, 2025
    Verified Purchase
    Installed on my Grand Design fifth wheel and works perfect. I can run the water without the pump kicking on for a long time. Works well with my on-demand water heater and no more pump cycling on and off when the tap is turned on low. Don’t waste you time on the cheap, small plastic accumulators. I had one of those before this one and there is no comparison.

Top reviews from other countries

  • Ron Bowers
    5.0 out of 5 stars Good product
    Reviewed in the United States on June 9, 2025
    Verified Purchase
    Works well, increases pressure for initial startup. Appears to be well constructed.
  • M. Flesland
    5.0 out of 5 stars Good solution
    Reviewed in the United States on July 16, 2025
    Verified Purchase
    Worked well with my system.  Make sure you have enough space.  I needed to pop a hose through 1 cabinet wall into the next but that was the only small challenge.  Beyond that it's nice to reduce to frequent pump cycles. 
  • Ramses
    5.0 out of 5 stars Excellent product and solution for your RV needs!
    Reviewed in the United States on June 3, 2024
    Verified Purchase
    Update to our review as of 10.30.2024

    We enjoy the performance of the tank on our regular RV trips boondocking. Life (pump) saver!

    We purchased 2nd tank and installed it under our bed. Please do not judge the mess we uncovered under the bed - it looks gazillion times better compared to how we found it to be. We had to build a "platform" out cedar 1.5x4 boards to lift it up above wires, etc. A bit of back and forth - it was all done in about 20 minutes. Sits nicely below our pullout drawer. Definitely had to reduce the pressure in the tank down to about 25 psi - it filled-up the tank about 1/2-3/4 full. Plenty enough. This one is serving bathroom/shower specifically. Whereas the prior we installed was in the kitchen.

    The image with tank up against the wall is in the kitchen location (next to water filter) - our 1st tank installation.

    Original Review:

    This is an excellent product and comes well-packaged. No surprises there. Installation was a breeze - 1/2" male threaded in (with a Teflon tape), connected with push-to-fit fittings into 1/2" PEX - all set.

    We added a shut off valve into our set-up. Additionally, our pressure was about 30 PSI, so at first (it came pre-charged with over 30 PSI) it did not fill the tank at all. So, we kept reducing the pressure down to about 18 PSI and it filled-up the tank quite well. Ran the tests via faucets - pump is quite. Depleted the tank - the pump kicked in.

    Two things to mention:

    1. When it arrives - do not use a box cutter to open up the top - we end-up "scoring" ours with a fine scratch by cutting the packing tamp at the top of the box. Just cut on sides, lift the top a bit and then cut it.
    2. If you are not seeing the results - measure your existing system PSI pressure. Unscrew the black plastic wide "nut" at the other end - reduce the pressure about 4-5 PSI lower than your existing system. Than it will work.

    Hope this helps others. Some of the negative reviews mentioned that there was "no change" - they just need to drop the PSI pressure for the bladder in the tank.

    Excellent product! RECOMMEND!
    Customer image
    Ramses
    5.0 out of 5 stars
    Excellent product and solution for your RV needs!

    Reviewed in the United States on June 3, 2024
    Update to our review as of 10.30.2024

    We enjoy the performance of the tank on our regular RV trips boondocking. Life (pump) saver!

    We purchased 2nd tank and installed it under our bed. Please do not judge the mess we uncovered under the bed - it looks gazillion times better compared to how we found it to be. We had to build a "platform" out cedar 1.5x4 boards to lift it up above wires, etc. A bit of back and forth - it was all done in about 20 minutes. Sits nicely below our pullout drawer. Definitely had to reduce the pressure in the tank down to about 25 psi - it filled-up the tank about 1/2-3/4 full. Plenty enough. This one is serving bathroom/shower specifically. Whereas the prior we installed was in the kitchen.

    The image with tank up against the wall is in the kitchen location (next to water filter) - our 1st tank installation.

    Original Review:

    This is an excellent product and comes well-packaged. No surprises there. Installation was a breeze - 1/2" male threaded in (with a Teflon tape), connected with push-to-fit fittings into 1/2" PEX - all set.

    We added a shut off valve into our set-up. Additionally, our pressure was about 30 PSI, so at first (it came pre-charged with over 30 PSI) it did not fill the tank at all. So, we kept reducing the pressure down to about 18 PSI and it filled-up the tank quite well. Ran the tests via faucets - pump is quite. Depleted the tank - the pump kicked in.

    Two things to mention:

    1. When it arrives - do not use a box cutter to open up the top - we end-up "scoring" ours with a fine scratch by cutting the packing tamp at the top of the box. Just cut on sides, lift the top a bit and then cut it.
    2. If you are not seeing the results - measure your existing system PSI pressure. Unscrew the black plastic wide "nut" at the other end - reduce the pressure about 4-5 PSI lower than your existing system. Than it will work.

    Hope this helps others. Some of the negative reviews mentioned that there was "no change" - they just need to drop the PSI pressure for the bladder in the tank.

    Excellent product! RECOMMEND!
    Images in this review
    Customer imageCustomer imageCustomer imageCustomer imageCustomer imageCustomer image
  • Johnnyd
    5.0 out of 5 stars Big positive difference.
    Reviewed in the United States on July 4, 2024
    Verified Purchase
    I recently purchased my first RV and was a bit surprised at the pump operation. It cycled continuously during use and pulsed the water. Not only is it loud and bad for the pump, it's just annoying overall. Basic plumbing makes it pretty shocking that this is set up without a pressure tank. I looked around and found this tank is about as big as I could fit in my fresh water tank area so I got it. I have a shurflo 4008-101-A65 pump which is pretty standard on a lot of RV's. Pump turns on at 38 lbs and shuts off at 55 so I inflated the bladder to 35 lbs as per the manufacturers instructions. Now the water system works like it should. Way quieter, smooth water flow and drastically reduced pump cycling. A huge upgrade for a very low price.
    Customer image
    Johnnyd
    5.0 out of 5 stars
    Big positive difference.

    Reviewed in the United States on July 4, 2024
    I recently purchased my first RV and was a bit surprised at the pump operation. It cycled continuously during use and pulsed the water. Not only is it loud and bad for the pump, it's just annoying overall. Basic plumbing makes it pretty shocking that this is set up without a pressure tank. I looked around and found this tank is about as big as I could fit in my fresh water tank area so I got it. I have a shurflo 4008-101-A65 pump which is pretty standard on a lot of RV's. Pump turns on at 38 lbs and shuts off at 55 so I inflated the bladder to 35 lbs as per the manufacturers instructions. Now the water system works like it should. Way quieter, smooth water flow and drastically reduced pump cycling. A huge upgrade for a very low price.
    Images in this review
    Customer image
  • Wil Burns
    5.0 out of 5 stars Works great!
    Reviewed in the United States on December 13, 2024
    Verified Purchase
    This has helped to preserve the life of our RV freshwater pump. We live in our RV full time and need the quality of this tank to keep us going. Easy installation. Just the right size to fit next to our pump. Functions very well when needed.