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This is our favorite style of sample valve for fermenters with 1.5" TC ports. The main difference between all the designs is how the valve actually holds back the liquids. Most of them use a screw knob that pushes a seal against a seat or gasket. Eventually that gasket gets nicked, cracked or otherwise damaged and you find out you have a leak with a full batch of beer fermenting behind it.
This particular style is more like a ball valve with a few interesting differences. Instead of a ball in between two seals, the "ball" is a tapered cone that requires no seals. Tension on the cone is adjustable with locking nut that holds the valve together. You can, and should, break the valve down to its few components in between fermentations to soak in starsan by removing that single locknut.
The other great feature of this unit is that it accepts a clamp-on dispensing coil. These coils have a lot of names; Sample Coil, Pig Tail, Proof Coil. Whatever the name, if your beer is carbonated in a Unitank or Brite Tank, you can't simply open up the sample valve or you'll have a cup (or face) full of foam. The Pig Tail Proof Sample Coil is available separately.
Don't forget that 1.5" TC flanges measure an actual 2". Material is 304 Stainless steel.
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Great product! 
