Single/Dual

• Single (137)
• Dual Assembly With Unions (137)
• Dual Assembly Without Unions (137)

Model Number

• 800 OP Series (90)
• 800 Series (96)
• 801 Series (90)
• 801DHC Series (45)
• 805R Series (45)
• CS5602A Series (45)

Inlet Connection

• 1/2" (366)
• 1" (45)

Outlet Connection

• 3/4" (366)
• 1-1/4" (45)

Pressure Relief Setting

• Custom (27)
• 50 PSI (6)
• 75 PSI (27)
• 100 PSI (27)
• 125 PSI (27)
• 150 PSI (27)
• 175 PSI (27)
• 200 PSI (27)
• 225 PSI (27)
• 250 PSI (27)
• 275 PSI (27)
• 300 PSI (27)
• 325 PSI (27)
• 350 PSI (27)
• 375 PSI (27)
• 400 PSI (27)