Pressure regulator cap for 1RL5020
I have a Devilbiss Air Compressor Model 1RL5020 that I purchased new in 1999. It's service has been flawless for the past 16 years. The pressure regulator manifold has a black plastic cap that screws onto the top of the manifold. When screwed shut, the cap releases air to the air hose and provides a seal, such that air does not leak out the top of the manifold. My cap is cracked at the top of the threads where it screws onto the top of the metal manifold. Is there any way to purchase a cap short of purchasing the pressure regulator assembly?
Original pressure regulator manifold with cap was AC-0076. This part number is obsolete. There are AC-0007 metal manifolds that have the plastic cap, but they are $43 and up. This seems a ridiculous amount to pay for a plastic cap. Outside diameter of the threads for the metal manifold is 1.25". Perhaps a cap with the same internal diameter?
Thanks for your help