Chemically inert 3-way Model 311 uses precision-machined components for precise and repeatable operation without adjustments or O-rings. Internal Teflon isolates media from working solenoid components, preventing premature failure. Valve features low internal volume (< 0.35 cc), power consumption of 1.5 W, and operating pressure to 30 psi. Body materials include Teflon, CTFE, PEEK, Tefzel, and stainless steel.