M21.5x1 Male x 55/64 in. - 27 Male Junior Size Cache Adapter

We purchased a water filter to mount on our kitchen sink only to discover none of the aerator adapters that came with it (or the extras you can call for) were compatible with our faucet. After three trips to the hardware store, we found no compatible adapters—we needed a plastic-threaded 55/64 male adapter, but with metric threading which nobody really carries. This is the only product I found that could work—held my breath until it arrived, and then it worked like a charm. Such a relief!!

Worked as an adapter for my new Delta Pilar widespread kitchen faucet. The top male end with metric threads and the blue washer fit into the Delta Pilar after I removed the aerator and the bottom end fit into my Brita filter. I found that local stores don't normally carry metric thread adapters and even Delta had discontinued this adapter for this faucet, online, so this piece was very helpful. Had to screw into Brita Filter before screwing into Delta faucet to get enough torque for it to fasten