Item – Check Valves Instrumentation Check Valve, Mechanism and Body Design Inline Spring, Body Material – Valves Stainless Steel, Pipe or Tube Size 8 mm, Connection Type Let-Lok x Let-Lok, Cracking Pressure 0.333 psi, Seal Material Fluorocarbon FKM, Max. Temp. – Valves 375 Degrees F, Min. Temp. – Valves -10 Degrees F, Max. Water Pressure – Valves 3,000 psi @ -10 Degrees F to 100 Degrees F, Spring Material 302 Stainless Steel, Application – Valves Fixed Cracking Pressure, General Purpose