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Complete piston and drive blade assembly for all P250L and P250T nailers. Piston rings are wear parts that should last over 1,000,000 cycles (approximately 200,000 sq ft) under normal use. Dirt or particles in the compressed air can reduce their life. Excessive piston ring wear will result in occasional unset or skipped fasteners. This problem can be temporarily resolved by placing a small length of tape between the piston and the ring (never exceed one turn). It is recommended to replace this part if the tool must be opened for maintenance and if it has been in use for a long time. P-992N, P-992S, and Q-993N Piston Assembly Kits: Even the toughest steel can be damaged if the driver blade strikes hard surfaces. Complete piston and driver blade assembly kits are available for the most popular tool configurations: -P-992N Piston/Driver Blade Assembly for P250L and P250T Nailers -P-992S Piston/Driver Blade Assembly for P250S Stapler -Q-993N Kit for the 18ga Q550 Nailer These kits, along with the modular motor for the P250 and Q550 pneumatic tools, allow for quick parts replacement on the jobsite in just 60 seconds!