Dispense valve assembly, two-way normally closed air pilot operated to open, spring biased to close, and rated for 3000 p.s.i. Material ports are 3/8 NPTF. Pilot port is 1/8 NPTF. Pilot with a 3-way air valve. Dispense valve has a 50 : 1 pilot to system ratio and valve doesn’t have snuff back. Internal grease flow orifice is approximately 1/4”. Grease flow is unidirectional meaning pressure over 400 p.s.i. applied to port two (usually the OUT port) will pass through to port one (usually the IN port) even when the valve has not been pilot operated. Minimum air pilot pressure is 50 p.s.i. with grease pressure of 3000 p.s.i. Replacement cartridge is part number 3438. Replacement manifold is part number 3437.