P6 Series 23 Gauge Headless Pinners are designed for longevity and optimal performance. Over time, drivers do fatigue and require replacement. GREX provides support for its P6 Series with Maintenance Kits. Detailed instructions are included making it easy to maintain your pinner. It’s never been more convenient. [Driver Kits include: 96649 Cylinder Cap O-ring, 63502 Piston Driver Assembly, 96634 Piston O-ring, 96650 Mini O-ring, 63505 Small Exhaust Seal.