O-ring and seal bf0073 kit, for Senco finish nailer models: SKS SFN1. 

Aftermarket O-ring Kit + Seal BF0073 (Brand New) (These are 3D Printed Parts) for older nailers (pre 94) 

There are 2 versions of seal BF0073 that I know of, I ship 1 of each per order.

And All the O-rings for newer nailers

for make: Senco

for models: SKS SFN1

O-ring and seal bf0073 kit, No other parts or nailer.

NOTE: Leaks from the exhaust of these nailers are usually due to the valve/cap being bad,

the only fix is replacing the valve.

O-rings will not stop the leak.