Jacobsen HR5111 Service And Repair Instructions page 127

HYDRAULICS
SECTION 8G. ANTI-SIPHON VALVE
REPAIR
Repair is limited to cleaning only. Use a punch, manu-
ally push poppet off its seat and flush with cleaning
solvent. If the problem still exists, replace valve.
Figure 8G-1. Anti-Siphon Valve
8G
8G-1