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Internet # 316899543

Model # 97309.05

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

  • Adapter for faucet with junior size hidden aerator
  • Thread size male M21.5x1 x male 55/64 in.
  • Attach appliance with regular size female threads
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Return this item within 90 days of purchase. Read Return Policy

Product Details

The NEOPERL Junior Size Cache Adapter is used in faucet spouts with male M21.5 hidden aerators. Remove your Cache aerator using the key you obtained when you purchased your faucet. Thread in the Cache adapter and use to connect an appliance or aerator with standard size female threads.
  • Acetal construction for greater durability and longevity
  • For use in faucets with hidden cache aerators
  • Top threads male M21.5 x 1
  • Bottom threads male 55/64 in.
  • Easy installation, no tools required
  • Lead free complies with reduction of lead in drinking water act
  • Return Policy

Additional Resources

From the Manufacturer



Dimensions: H 0.630 in, W 0.8594 in, D .8594 in


Inlet Diameter (In.)15/16Outlet Diameter (In.)7/8
Product Depth (in.).8594 inProduct Height (in.)0.630 in
Product sizeMale M21.5x1 x Male 55/64"Product Width (in.)0.8594 in


ApplicationBathroom Sink, Kitchen SinkColor/FinishGray
Color/Finish FamilyGrayFits Faucet BrandAll Brands
Installation Hardware TypeAdaptersMaterialBrass
Multiple SizesNoPack Size1
Plumbing Part TypeAdapterReturnable90-Day

Warranty / Certifications

Manufacturer WarrantyLimited 1-year warranty

Questions & Answers

Q:Which side has the M21.5 threads? - the one close to the blue ring?
by|Jan 15, 2022
2 Answers
Answer This Question

A:  Both sides do.

by|Nov 21, 2022

    A:  The top threads as seen in the photo on this product page.

    by|Jan 17, 2022
      Showing 1-1 of 1

      Customer Reviews

      5 out of 5
      • 5
        out of 2 reviews
      • 100% recommend this product
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      Showing 1-2 of 2 reviews
      ONLY EXISTING ADAPTER for Moen/Delta sinks!
      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!!
        • Recommended
        Works as adapter for Delta Pilar
        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
          • Recommended
          Showing 1-2 of 2 reviews