true union

Hi guys. I will be buying a spears gate valve but will also need like true union ball valves and I wanted to save a few dollars as these will not be required for real flow management other than to turn on or off. I have seen these two you guys have any real life experience with these? They are...

So i am building a new 300 gallon tank and i was given the link to supplyhouse.com for fitting and they sell red flag valves for a great price but im afraid it may come at a cost. for instance a 3/4" true union schedule 80 valve on BRS (cepex) is $22.00, the same thing made by (red flag) is...