The Birzman Maha Push & Twist V Floor Pump is a tough and durable floor pump made from 6061 aluminum so that it will last for years to come. With the equipped CAD System you can adjust your inflation on the fly and release pressure so that you can achieve optimal inflation. This Birzman pump is compatible with both Presta and Schrader under the same simple steps: Insert, PUSH the collar down, and TWIST it by one turn to secure engagement; simply pull back the collar to disengage.