THE MAGNUM VALVE BODY IS MACHINED FROM 7075-T6 ALUMINUM BAR-STOCK, IT'S NOT A MODIFIED FACTORY DISCOVERY VALVE

OUTPERFORMS THE BAKER AIRGUNS BOSS MAX-FLOW VALVE BY NEARLY 200% MORE POWER

SLIGHTLY MORE POWERFUL THAN THE COTHRAN POWERHOUSE VALVE FOR .177 - .25 CALIBER AND ALLOWS A MORE PRACTICAL POWER CURVE

NOT COMPATIBLE WITH MAXIMUS MODELS. IT IS WIDELY BELIEVED MAXIMUS AND DISCOVERY HAVE IDENTICAL TUBES AND VALVES, THIS IS NOT TRUE. THE VALVES ARE RADICALLY DIFFERENT WITH MOUNTING SCREWS IN COMPLETELY DIFFERENT LOCATIONS. THE MAXIMUS VALVE IS NEARLY IDENTICAL TO THE MARAUDER PISTOL VALVE BUT WITH ONLY TWO MOUNTING SCREWS.

The valve-body is a first of it's kind design that blends the Discovery and Marauder Pistol valves together with a large angled port. The angled port is .150" ID which is the optimal size for .177 - .25 caliber with ammo in the 10-35 grain weight range. It has an ultra-light stainless steel internal spring. This is the lightest, most versatile and most powerful valve on the market for small-bore Discovery and 22XX PCP conversions. It produces more power with less air usage and opens easier under high pressure due to the small valve-stem diameter, so it's capable of more than doubling the power of a Discovery rifle at around 55 FPE compared to the factory valve at around 24 FPE. With a 26" Maximus barrel mounted on a Discovery 62-64 FPE is typical. In .25 caliber with a 28" custom barrel it produced 105 FPE with a 35 grain slug.

It's extremely efficient, so it works well at low power levels also, increasing shot count and reducing the hammer-spring tension required which allows a lighter hammer spring for easier cocking and reduced noise and vibration during the firing cycle. This is a direct-fit part, no modifications are necessary to fit your Discovery, other than requiring our custom Discovery valve screws if using more than 2200 PSI. For 22XX PCP conversions you need to add the side-position valve screw holes to your tube and use three of our custom valve screws for 22XX. Your original transfer sleeve (port) and gasket can be used or one of our custom sleeves. A .150" - .156" ID transfer port is recommended for the best FPS, power peaks at about .150" and starts to drop at around .157" ID. With the factory transfer sleeve which varies at around .144" - .148" ID, you still get 95 - 97 % of the power level as with .150" ID.