CAUTION! 
Make sure to completly empty the air from your PCP airgun before replacing Foster Fitting. 
 
Replacement Foster Fitting for the 357, 457 & 257 caliber Benjamin Bulldog. Compatible with all generations of Bulldogs. Includes teflon tape, ready to install. 
 
These valves can fail over time, more likely when your air source contains high humidity. Make sure to use dry, clean air when filling PCP airguns.