Thank you for your inquiry on the Everbilt 1-1/2 in. Copper Pressure Tube Cap Fitting. The overall length of the 1-1/2 in. NIBCO 617 copper tube cap is 1.22 in. If you have additional questions, you can reach a NIBCO Technical Services Advisor, M-F 8am - 5pm EST, by phone at (888) 446-4226.