The WGP "Ergo" is a copy of the PPS Stabilizer, albiet it works in reverse. (Turn the screw in to reduce pressure, back it out to increase)
I ran one on a Spyder with a 20 ounce anti-siphon tank for years with excellent results. I think I paid $20.00 for it used. I still have it and run it on a Sterling, original seals and seats.
Fearlessly, the idiot faced the crowd, smiling...