The IS series has the following characteristics and/or options:
Clear PVC tube and piston flow indicator
Optional clear polysulfone tube and piston
Flow indicator
316 stainless steel spring and shaft
Viton or Kalrez seals
End fitting materials offered: brass, aluminum, 316 stainless steel, & PVDF (Kynar)
Ultra Pure Water indication of flow rate to tools, on deionized water returns, and UPW returns