The Hiblow HP-200 is a compatible replacement for the Gast SPP-200, Thomas 5200, and many other 200 LPM air pumps. The Hiblow HP-200 is commonly used on many 1500 GPD systems. This unit is brand new. Works As A Replacement For The Following Models. Aqua Safe AS120 Aqua Safe AS1500 Aqua Safe AS1200EZ Aqua Safe AS1500EZ Aqua Safe AA1200 Aqua Safe AA1500 Delta Whitewater DF150 Delta Whitewater UC150 Hoot H1500 Hoot LA1500 Mo-Dad 1500