A bidet’s T-adapter usually goes under the tank, between the toilet’s 7/8" fill valve thread and the supply line. If you can’t reach that end, LUXE and TUSHY sell adapters that go on the 3/8" shutoff valve on the wall instead.
Where can you fit the T-adapter?
How big is the valve’s outlet?
LUXE’s check: hold the 3/8" end of a 7/8" tank adapter flush against the valve outlet.
The T-adapter you need
A 7/8" x 7/8" x 3/8" T-adapter
Its top screws onto the fill valve’s 7/8" thread under the tank, the old supply line goes on its bottom, and the bidet hose on its 3/8" side outlet. LUXE’s NEO Plus and TUSHY’s Classic, Spa, Wave and Oasis use this size.
On the package: 7/8 in. x 7/8 in. x 3/8 in. T-adapter
Available on Amazon
The T-adapter you need
A 1/2" tank T-adapter
LUXE sells one for fill valves outside North America and on RV toilets, for its original NEO bidets only.
On the package: 1/2 in. T-adapter
Available on Amazon
The T-adapter you need
A 3/8" compression T-adapter at the valve
It screws onto the wall valve’s 3/8" outlet, the supply line goes on its top, and the bidet hose on its side. TUSHY’s skirted-toilet adapter is 3/8" compression on all three ends.
On the package: 3/8 in. compression T-adapter
Available on Amazon
The T-adapter you need
A 1/2" T-adapter at the valve
LUXE says 1/2" supply valves are common outside the US and in dense US cities such as Los Angeles and New York, and TUSHY asks buyers in California to check for one.
On the package: 1/2 in. T-adapter
Available on Amazon
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Use the adapter made for your bidet’s own hose. The side outlet differs between makers’ models.
T-adapter sizes by maker
| Adapter | Where it goes | Sizes |
|---|---|---|
| LUXE Cold Water T-Adapter (NEO Plus) | Tank fill valve | 7/8" x 7/8" x 3/8" |
| LUXE Cold Water T-Adapter (original NEO) | Tank fill valve | 7/8" x 7/8" x 1/2"; a 1/2" version for 1/2" fill valves |
| LUXE 3/8" ALL T-Adapter | Toilet or sink supply valve | 3/8" on the valve and the hose ends |
| TUSHY 7/8" Brass Tank Adapter and Plastic Mega Adapter | Tank fill valve | 7/8" male x 7/8" female x 3/8" male |
| TUSHY adapter for Aura, Cloud, Cloud+ and Ace | Tank fill valve | 7/8" x 7/8" x 1/2" |
| TUSHY Brass Mini Adapter (Skirted Toilet Kit) | Angle valve on the wall | 3/8" compression on all sides |
TUSHY’s pages call its 7/8" ends compression fittings. The 7/8" end is the same tank thread a toilet supply line’s 7/8" ballcock nut screws onto.
The tank adapter’s bottom takes your existing supply line, which is 3/8" compression x 7/8" ballcock on a standard toilet. See toilet supply line size if you’re replacing it.
Skirted toilets and hidden fill valves
LUXE’s alternative installation is for a fill valve that’s hidden, blocked off or fed by a hard supply line that can’t be removed, or where there’s no room for the tank adapter. The T-adapter then goes on the wall valve, with the supply line moved to its top, and a longer hose runs up to the bidet. TUSHY’s brass mini adapter does the same job, and TUSHY also uses it when the space between the angle valve and the tank won’t fit its mega adapter.
Shut-off and warm water adapters
- With a shut-off: LUXE’s shut-off T-adapter for NEO Plus is 7/8" x 7/8" x 3/8", and its valve lowers the bidet’s water or turns it off. TUSHY’s childproofing adapter has a handle to turn the bidet’s water off at the wall, and a 1/2" hose connection where its standard adapter has 3/8".
- Warm water: LUXE’s hot water T-adapter goes on the sink’s hot supply valve, 3/8" or 1/2", with the sink’s own supply line on its top. Its hot water shut-off adapter measures 2.2" x 1.3", so check there’s that much room between the sink valve and the wall.
Most US shutoff valves have a 3/8" compression outlet, though 1/2" and 7/16" outlets exist. For valve sizes, see shutoff valve size.
Turn the water off at the wall valve and flush the toilet before you unscrew the supply line. Check every joint for drips when the water is back on.