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

Tank appears to be well constructed and installed and working properly. One caution, if you’re going to hard pipe to the half inch pipe size water connection be sure to use the backup nut so you don’t bend the tank shell.

This is a rare thing, it is made with quality in mind. Even the shrader valve is anodized, capped and then capped again with a plastic protector. Higher than average maximum pressure rating and removable mounting bracket. I used a 1/4" compression x 1/2"npt Swagelok fitting on the connection, but a $7-$10 brass fitting of the same specs would work. This fitting does not typically come with RO tanks. size- I used a 4 gallon tank before this and the size was excessive for me. This smaller tank is actually more expensive (kind of typical), but it is also MUCH higher quality than my previous tank. reliability - only in use for a week, will update if I have any problems.

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.

I am amazed how well this makes our RV system work! Easy to install.

The tank seems to work well. I use it to buffer the pressure shock of my well pump shutting off after pumping water to a water tank above my house. However the tank did not come with a manual. I had to call the firm to fid out if I should re-pressurize it for my 50-90 psi system. Whoever I eventually spoke to said to leave the empty air pressure in the tank at 30 psi. This will mean that the using my pressures the bladder will be smaller than normal in a tank of this size. In the past I have pressurized the air in similar tanks to 52 psi. In the future I will make sure the tank has a manual with it that explains what pressure the air pressure should be.

2025 update: I used this for 7 camping seasons without issue and enjoyed it soo much that I removed it from the camper when I sold it. I'll be installing it in my new rv but with pex fittings this time. I never had any leaks with the pvc ball valve and clamps but less chance of leaks with pex I think. I bought this for my RV to stop my pump from short cycling. This tank cost the same as the tiny ones sold at RV stores but this will hold a gallon of water. That means no more pump cycling in the middle of the night when the toilet is flushed. I have mine set at 30psi, which provides enough pressure to wash your hands without the pump kicking in. This reduces electrical load on your RV batteries as well since when the electric pump turns on it draws its full amp rating and then scales down as it continues to run. This tank has a bracket already attached so I just had to provide 2 screws to mount to the floor by my pump. A word of advice though, go to your local big box home improvement store and get a PVC ball valve and some sprinkler pipe adapters to plumb this sucker in. That way you can isolate it from the system for winterizing your RV and not have to fill it with the pink stuff. It also allows you to easily remove it if needed without affecting the water system.

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!

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.

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.