P6 Series 23 Gauge Headless Pinners are designed for longevity and optimal performance. Over time, O-rings 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. [O-ring Kits include: 63003, 96649, 96631, 96632 (x2) 96059, 96634, 96650, 96633, 63505]