Bathroom faucet adapter for a portable washer (13/16-27)

To connect a portable washer to a bathroom faucet, you need an adapter for the bathroom aerator’s thread, usually 13/16-27, sometimes metric, and almost never the 15/16 or 55/64 size that kitchen washer adapters are made for. For the common 13/16-27 case, the DANCO 10522 converts the faucet thread to a standard 3/4” garden hose thread, which most washer fill hoses expect. Unscrew the aerator, check whether its threads are on the inside or the outside, match it at a hardware store if you’re unsure, and then screw on the adapter and hose. Metric faucets need a metric adapter instead.

Why kitchen adapters don’t fit bathroom faucets

Kitchen faucets in the US mostly use two aerator threads: 15/16-27 when the threads are inside the spout, and 55/64-27 when they’re on the outside. Dual-thread washer adapters like the Hibbent cover both, which is why they work on most kitchens. The faucet adapter guide explains those two families.

Bathroom faucets are often smaller. A 13/16-27 aerator shares the “27” thread pitch with the kitchen sizes, but it’s a smaller diameter. A kitchen adapter won’t start on it, and forcing it damages the faucet threads.

How to tell what you have

1. Close the faucet and put a towel in the basin so small parts can’t go down the drain.
2. Unscrew the aerator by hand, or with a cloth-wrapped pair of pliers if it’s tight.
3. Look at the faucet end. Threads on the outside of the spout mean a male faucet thread. Threads on the inside mean a female faucet thread.
4. Compare sizes. If the aerator is noticeably smaller than a kitchen one, you’re probably looking at 13/16-27 or metric.
5. Not sure? Take the aerator to a hardware store and thread-match it against the adapters on the shelf. That beats guessing online.

Some bathroom aerators are hidden inside the spout and need a special key to remove, and some don’t come off at all. If yours won’t come off without force, stop. That faucet isn’t a washer fill point.

The adapter: DANCO 10522

The DANCO 10522 aerator adapter at Home Depot (not an affiliate link) is what we’d start with for a 13/16-27 bathroom faucet. Danco and Home Depot list:

• Chrome-plated brass
• 13/16-27 male x 3/4 garden hose male, or 13/16-27 female
• Low lead; complies with the Reduction of Lead in Drinking Water Act
• Three connection options: female garden hose or male aerator to a female faucet, and female aerator to a male faucet

In plain terms, it screws onto the faucet where the aerator was and gives you a garden-hose-thread end for the washer hose. Danco also lists it on its own product page.

We haven’t confirmed an Amazon listing for this exact Danco part through a source outside Amazon, so we link Home Depot instead.

Check before you buy: confirm your washer’s fill hose end. Some portables come with a quick-connect kitchen kit rather than a garden hose fitting. If yours does, you may need the matching hose coupler on top of the faucet adapter. Read the manual.

Metric bathroom faucets

Some newer or imported bathroom faucets use metric aerators, commonly described as M22 or M24. Those need a metric-to-garden-hose adapter, not the 13/16 part. Measure and match in a store; don’t guess.

Hooking it up

1. Wrap the faucet threads with plumber’s tape if the adapter has no washer, following the tape direction for the thread.
2. Screw the adapter on hand-tight.
3. Attach the washer’s fill hose to the adapter.
4. Turn the faucet on slowly and watch the joints for drips.
5. After the load, close the faucet and put the aerator back. Close it between loads so the washer’s inlet valve isn’t holding line pressure.

Bathroom faucets are lighter than kitchen ones. Support the hose so its weight doesn’t hang off the spout.

Is the bathroom the right fill point?

It often is if:

• your kitchen has a pull-down faucet, which shouldn’t carry a washer hose. See pull-down faucets and portable washers.
• you’re draining into the bathtub anyway. See twin tub into a bathtub.
• the kitchen is too small for the machine.

For machine picks in a bathroom setup, see the bathroom sink washer guide. For the full hookup sequence, see the sink setup guide.

Quick reference