Orbit DripMaster 67790 4-in-1 Drip Irrigation Valve by Orbit DripMaster. $29.93. One-piece construction-combines a low-flow drip valve, filter, 30 psi pressure regulator and 1/2-inch drip tubing adapter.. Fits all 1/4-inch male thread micro-spray heads. Includes 1/2-inch drip tubing adapter - works with 690 to 710 diameter drip tubing. Filtration-removable 200 mesh filter with flush port. Manual bleed lever - for flushing and testing. 4-in-1 drip irrigation valve stands in ...