Toto Spares, Toto Parts, Toto Spare Parts, Spare code No : TH679A.
TOTO TH679A details
TOTO TH679A is a check-valve unit (non-return valve) used inside certain TOTO faucets/mixers. TOTO identifies the part as 「逆止弁部」 (check-valve section). C
Com-et
- Spare part: TH679A
- Part name: Check valve unit / non-return valve
- Main purpose: Allows water to flow in one direction only and prevents reverse flow. E
- E-Connect
- Typical application: TOTO bath/shower mixer faucets
- Known compatible/representative models: TMJ40C, TMHG40, TM725CHRX, and several other TOTO faucet models. M
- Monotaro
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- Production: TOTO's parts database shows TH679A has been in production since September 1995 and is not currently marked as discontinued. C
- Com-et
- Quantity: Normally supplied as 1 check-valve unit. M
- Monotaro
What does it do?
In a thermostatic/mixing faucet, hot and cold water are supplied through separate passages. The TH679A prevents water from one side from flowing backward into the other supply line when there is a pressure difference.
A failed or worn check valve can contribute to:
- Hot water entering the cold-water line
- Cold water entering the hot-water line
- Unusual temperature fluctuations
- Difficulty getting stable mixer operation
TOTO documentation also recommends periodic replacement of check valves in applicable thermostatic mixers because failure can allow reverse flow. T
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Important: TH679A is not a cartridge and not the main temperature-control valve; it is specifically the non-return/check-valve component.
If you give me the TOTO faucet/mixer model number, I can check whether TH679A is the correct spare, and show its location, dimensions and installation position.
TOTO TH679A — uses
TH679A is a TOTO check-valve unit (non-return valve) used in TOTO water faucets/mixers. TOTO's own parts database lists the part name as 逆止弁部, meaning check-valve section. C
Com-et
+1
What it does
- Allows water to flow in one direction only.
- Prevents reverse flow/backflow through the faucet's water passages.
- Helps prevent hot and cold water from flowing backward into each other's supply lines in applicable mixer faucets.
- It is mainly a faucet/mixer repair spare, not a toilet spare.
Typical TOTO faucets using TH679A
Examples include:
- TMJ40C
- TMHG40
- TM725CHRX
- TMF49C1GA
- TMF49E
- TMJ40C3R
- TMF49ASS / TMF49AN
There are additional compatible models, so the exact faucet model should be checked before ordering. M
Monotaro
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When TH679A needs replacement
A worn or damaged check valve can cause backflow, unstable mixing, or cross-flow between hot and cold water lines. TH679A is specifically sold as a replacement check valve for these TOTO faucets. E
E-Connect
In simple terms:
TH679A = TOTO faucet/mixer non-return valve → stops water from flowing backward.
If you give me the TOTO faucet model number, I can identify exactly where TH679A is installed and how many pieces are required.
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