- Adapter - garden hose-female X 1/2" NPT-female
- Bushing - 1/2" NPT-male X 1/4" NPT-female (Weatherhead 3220-8-4)
- Adapter - 1/4" NPT-male X 1/4" compression (Weatherhead 68-4)
- Tubing - 1/4" O.D. copper
- Adapter - 1/4" compression X 1/4" NPT-male (Weatherhead 68-4)
- Street tee - 1/4" NPT-female X 1/4" NPT-male X 1/4" NPT-female (Weatherhead 3750-4)
- Street elbow - 1/4" NPT-male X 1/4" NPT-female (Weatherhead 3400-4)
- Air regulator - 1/4" BSP-male X 1/4" BSP-female *close enough to NPT thread (G. Hjukstrom SV-9609)
- Nipple - 1/4" NPT-male X 1/4" CEJN-style (Greenline CP61)
- Reducing coupling (galvanized) - 1/4" NPT-female X 3/8" NPT-female
- Nipple (galvanized) - 3/8" NPT-male X 4" long
Close-up of venturi area.
The assembled rig
Hoses connected
Spraying water quite well, but no water hammering action at all.
Without having to add a pressure chamber, my ideas are to try:
- A restrictor in the garden hose fitting,
- moving the copper tubing further back into the tee,
- increasing the size of the tee from 1/4" NPT to 3/8" NPT, and the nozzle from 3/8" NPT to 1/2" NPT, or
- a special reversed check-valve with a ball bearing and a spring in the garden hose fitting.