Graco Prime Valves Maintain precise pressure control and effortless system priming with Genuine Graco Replacement Prime Valves. The prime/spray valve is one of the most critical mechanical components on your airless sprayer, routing fluid either back down the drain line during priming or up into your high-pressure hose during application. Over time, the highly abrasive pigments and solvents flowing through the system wear down internal metal seats, leading to pressure bleeding, slow priming, or paint leaking into the return line during a spray cycle. Upgrading your paint-covered or worn-out valve with an authentic Graco factory replacement ensures a reliable, airtight seal that keeps your airless paint sprayer in peak working order for years to come. To ensure an exact fit and flawless performance, cross-reference your machine line with the specialized part numbers below or consult your sprayer's manual: Graco 239914 Prime Valve: Replaces or services mid-range architectural electric pumps from the 190 PC Express through to the Ultra Max II 595 PC. Graco 24B156 Prime Valve: Engineered for high-production commercial, gas, and texture rigs, including: Ultra Max II & Ultimate™ MX II: 695, 795, 1095, 1595 GMax™ Petrol Units: 5900, 10000, GMax II 5900, and 5900 HD Professional Stripers & Electric Texture Rigs: LineLazer™ 5900 and Mark V Graco 17J925 Prime Valve: Tailored for small-to-midsize property maintenance and DIY series pumps, specifically the Magnum ProX17, ProX19, GX19, and GX21.
