Jabsco 30573-0000 Marine Pressurized Water Accumulator Tank with Bladder (1-Liter), Black

Arrived in four days. Amazon under-promise and over-deliver. Excellent service. As for the accumulator, I bought to replace a 9 year old unit - the old one had developed a small approx 4mm crack in the membrane (bladder). It's a pity it isn't possible to buy just the membrane. The unit is very simple - three main parts. The lower half has the hose connections. The upper has the air valve. Both halves bolt together with a rubber membrane/diaphragm/bladder in between which also doubles as a seal between the halves. It's a waste that I can't simply replace the faulty membrane. Despite not being able to save the planet this time, great service from Amazon. I should add that I live in the UAE and am not accustomed to such short delivery times.

The accumulator has now been fitted and has cut down the stop start of the freshwater pump considerably .

Le compresseur fait très bien son travail; mais ce n'est que par hasard, après plusieurs semaines, que je suis arrivé à le faire travailler comme je le souhaitais : le taux de compression maximal de l'air est bien indiqué, mais pas celui de fonctionnement conseillé; et ils sont très différents. :-(

I was really gratified at the huge improvement this little one liter accumulator made for my marine potable water system, no more cutting in an out or stuttering when I wash my hands or a dish. Increasing the pre charge was easy with a bicycle pump and gage. Manual says to set 3 psi below cut in pressure, a label on the box says 2; I used 3 but I doubt that matters much. I was worried about the o ring seal and retaining clips, but it hasn't leaked a drop all summer.

It is relatively small and very easy to install. Functions as advertised at lest so far into a months use.

This is a great bit of kit, evening out water flow, essentila for an instantaneous water heater. However, I feel that it is seriously over priced being just a bit of plastic and rubber. It can't cost a lot to make. Also, spare bladders/diaphragms are not available, if there is a split in the diaphragm you have to buy a whole new unit. My first one lasted at least 10 years and I will buy anotherwhen this one fails.