Parker Pumper Replacement Standard Size Air Filter 4-1/2 Outside Diameter 3-1/2 Tall Billet Aluminum Mounts The hemispherical dome shape prevents

The hemispherical dome shape prevents the splines from being damaged which would prevent you from removing your CV joint

and provides optimum weather

Spring Rate: 100 lbs/inch - 1

See below for actual decimal dimension

The Pro 4 will fit any 14"x 18" four-vertical-tab mounting system

Parker Pumper Replacement Standard Size Air Filter 4-1/2 Outside Diameter 3-1/2 Tall Billet Aluminum Mounts The hemispherical dome shape preventsParker Pumper fresh air system replacement element should be replaced after every race. Keep a couple for dusty or longer races. Parker Pumper fresh air system replacement element should be replaced after every race. Keep a couple for dusty or longer races.