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I have my third bypass valve coming from them as of today. This is the valve that diverts heater core back to engine vs into the core.

I am not sure why they are failing? Anyone have a guess other than terrible build quality?

1. Its a pinch joint that is o-ringed
2. Leaks when the engine is shut off and heat/psi build.
3. It is away from excessive heat.
4. 160 T stat.
5. Fans come on at 190 off at 180
6. Engine runs at 165-180 depending on the day/heat/load at speed
7. Running slow speeds or sitting it creeps normally and comes down easily with fans.

I see no reason for these to fail?

Where does it fail? What are the symptoms?

I have been running one in my LS swapped vette for almost 10 years now with no issues.

Edit: to clarify, I am asking where it is leaking from. Do you have a picture of the leak?

You may have it in the return hose instead of the pressure side. You may have the flow backwards.
The coolant may be acidic damaging the seals.

George

As I think about it more, I recall having a hard time figuring out the correct way to hook it up.

The way mine is plumbed, when it is not activated, it connects the inlet and outlet so it forms a loopback to the engine and isolates the heater core.

Could you have it backwards so that the loopback is on the heater core side and you are dead-heading the engine side? That would cause significantly higher pressures on its inlet side and could be blowing them out.

Seemed to be working properly? I followed the picture to a T on installation? I will take a pic of where it is leaking in the AM.

Installed backwards it will work fine until it fails from the overpressure.

Here is a pic. It is failing on the bottom chrome ring.

In that picture, are the installed hoses going toward the engine or the heater core?

Edit: that is a different design than mine. Mine is a solenoid type, not a flapper valve type. Per their documentation, your existing hoses (in that picture) should go to the engine.

The new design doesn't deadhead any of the connections when it is closed.

On the pic the two that have no hoses go to the core. The other two are to the pump and intake.