https://www.coxhardware.com/c-840-compressed-air-safety-valves.aspx weekly 0.7 https://www.coxhardware.com/p-3210-tank-valve-18-in-male-npt.aspxdaily0.9 https://www.coxhardware.com/p-3207-safety-valve-125-psi-14-in-male-npt.aspxdaily0.9 https://www.coxhardware.com/p-3208-safety-valve-150-psi-14-in-male-npt.aspxdaily0.9 https://www.coxhardware.com/p-3209-safety-valve-200-psi-14-in-male-npt.aspxdaily0.9