Delta RP51505 Cache Aerator Adaptor to Standard 55/64-Inch - 27 Male Thread

I have a delta faucet installed and it has an annoying recessed internal aerator with an usual size. I was unable to find anything to allow connection to my portable washing machine or PUR filter at Home Depot, or even any idea of what to buy. It took a few months of sporadic googling to find the answer & it's this!Completely plastic & I was afraid to put too much pressure on it; however, there is no leaking after a month of use w the PUR filter so it's not flimsy.

This is not threaded correctly for Delta Bellini faucet (Model No. 11946-SSSD-DST). I wish I had read ALL the reviews before buying this because I missed the one that gave it one star because it did not fit even though the manufacturer claimed it would for all it's faucets with "Cache aerators." I wish I knew the thread pattern for my faucet so I could have known it wouldn't work. However the thread pattern for Bellini cache aerators seems to be a closely guarded secret because it isn't listed on Delta's website, it's installation manual, or anywhere else in it's official literature.** UPDATE: Delta responded to a custormer service email inquiry that there are two possible threadings, the older one is threaded to M24-1 and the newer one is M21.5x1-6 male. Even the newer instruction booklet for this faucet fails to list the threading or the part number for the aerators. So unless you know the threading of your faucet, it's a crap shoot whether this will fit yours.

I have the Bellini Single Handle Kitchen Faucet with Spray and Soap Dispenser purchased from Lowe's and also the generic swivel sprayer attachment sold there as well. Lowe's didn't sell the adapter to connect the two but awesome-as-always Amazon had it and for a decent price.BTW, I emailed a Delta representative for the part number that would work for the thread sizes I needed and they emailed back a couple of choices, this being one of them.

I have a Delta single-handle faucet in my bathroom that came with an aerator you couldn't just unscrew by hand. You have to use a little black plastic tool that has notches that fit the aerator. I was OK with that at first but my water softener went out and leaked the little tiny gold beads of resin into my water pipes and clogged my aerator at 3:00 am. I was not happy trying to get the notches on the tool to fit the notches on the aerator when I was half asleep and just trying to wash my hands. Thankfully I had put the little tool in the bathroom vanity drawer next to the sink and I eventually got the aerator off. (With lots of bad words.) None of my other faucet aerators clogged with the leaked resin -- only this one. It has a very fine screen. I couldn't get all the resin out of it when I used my waterpik on it. So the next day I went to the hardware store to get a new aerator. It is not a standard size. (I have no idea who thought up this brilliant idea.) I called Delta and got a woman who was very little help. I explained to her that my kitchen faucet is Delta; both shower controls are Delta; and this bathroom faucet is Delta but i don't plan on buying any more Delta faucets if they come with non-standard aerators. You can't use the faucet without an aerator because the water sprays everywhere. She said they would send me a new aerator (which is not what I want -- it'll need the same stinking tool.) So I searched their site for my model number and then searched their repair parts for my faucet (Model 520-DST). I found this part on their site but figured it would take a long time to get it from Delta. So I ordered it from Amazon and it came in a couple of days. This thing is a gray plastic with an o-ring along the circumference to keep it from leaking. I had to put silicone grease on the o-ring to get it to seat properly in the faucet. Then I put a standard female thread aerator on the faucet. It works fine but I am going to go back to the hardware store and see if I can find a low profile aerator because this combination sticks out pretty far. At least I can unscrew the thing at 3:00 am if I need to!

It did not work on the faucet that we were hoping it would in order to use our new PUR faucet filters.

After so much fruitless searching and countless hardware store representatives saying, "No, it's impossible!" - I finally hooked up my blasted Haier portable washer to my pull-out Delta faucet. This doo-dad temporarily replaces the aerator in the faucet to a standard non-Delta size to use on quick-release connections for portable washers. It leaks a little bit so I'll try using teflon tape on it next time. I've used it for 4 loads of laundry so far and nothing has exploded yet!Disclosure: Supposedly connecting portable washers to pull-out faucets is not recommended due to pressure build-up, but hey, I like to live on the wild side.

Works and fits fine but it should reasonably be assumed to be single or at most a few use because there is no way to remove it when it's tight enough not to leak without destroying it. I finally had to cut notches in it to turn it out which then of course made it no longer seal at the bottom. If they'd just put ridges around the "fat" ring you could actually grip it.

This adapter was needed to attach a Wingsol FM001 water filter to my new Delta model 2497LF Cassidy faucet. None of the adaptors that came with the Wingsol fit the Delta spout as it was an oddball 21.5mm threading. I just used this adapter and attached the Wingsol, everything appears to be working fine for now, no leaks. It was recommended to use some plumbers tape on the threads which screw into the Wingsol which I did. Hopefully this adapter will continue to work fine.