Staff of TSDS have used swivels on their various 2nd stages of regs for years. It drastically reduces mouthpiece soreness and makes a Full Face Mask more comfortable also; no pull !!
***Includes extra rebuild kit with tools, O-Rings and Silicone Grease
These begin to leak after a few years of use so this is a wonderful product due to it including everything needed to bring it back to new condition.
Granted, this is a very low cost solution for a swivel but it does work very well if kept lubricated.
If it is your desire to have a much much higher quality and therefore priced unit please look at our Omni Swivel unit as an alternative. TSDS staff use both and the big difference is cost; even at the staff cost some feel a Chevy runs down the road as well as a Rolls Royce (which is a good way of describing this product and an Omni Swivel).