As a quick fix you can simply find the correct size stainless steel or brass bolt.
SP used 3 different sizes in their regs, they are:
5/16- 24 .............. 7/16-20.................. 9/16-18
Herman, would you double check the smallest thread size? It looks to be the same size as a low pressure 3/8-24 port plug while the middle is the same as a 7/16-20 high pressure plug. Indeed they screw right into the respective ports.
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