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1. O-rings in trigger valve housing are damaged. 1. O-rings must be replaced & operation of safety nose must be checked. Air leaking 1. Loose screws in housing. 1. Tighten screws. between housing 2. Damaged O-ring. 2. Replace O-ring and hose. 3. Loose air fitting. 3. Tighten air fitting & use teflon tape. Air leaking between housing and cap. 1. Damaged seal. 1. Replace damaged seals. Tool skips staples 1. Excessive air pressure. 1.Reduce air pressure to tool. while discharging. 2. Air leaks. 3.