Does anyone know where I could buy a 1 1/4" 4-way valve thats cheaper than a Tekmar 722? All I found so far was a tekmar from pex supply at $123.00 and then you need the actuator for it at $250.00 That seems a little expensive but if that's the average I guess i'll have to save my pennies. I just bought a GEA 5x12 50 plate heat exchanger and was wondering is is important to use a stainless union to connect it to the piping or is brass good enough?