Plumbing – How to join two fixed male pipes

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I'm reassembling the gas line to my hot water heater. I'm at the last joint and I have the problem shown in Fig. 1.

I need to join A to B where A and B are both male and both fixed at the other end. So I'm considering using a coupler C. The problem is, no matter which way I rotate C, it's going to loosen at either A or B while tightening at the other. (And I need C to tighten at both A and B.)

How do I solve this problem and join A to B? Is there maybe a different fitting to use? Am I missing something, either obvious or not-so-obvious?

Fig.1. Union of two male, fixed pieces of pipe

enter image description here

Edit: I just found this related answer over at engineering.SE.

Best Answer

You want something like a pipe Union. You might have to check with local codes though cause you might need have the union at the appliance with gas lines. I am not 100% sure, a plumber would know. https://www.discounthydraulichose.com/product_p/65-union.htm

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