How to this pool heater gas line be disconnected

natural-gaspool

This is a picture of the natural gas connection going into a pool heater. The heater no longer works. I just want to remove the heater and cap the gas line.

Please see the picture. I'm not sure what the different parts are here. Can someone direct me where I should clamp my first wrench and which fitting to loosen based on the picture?

enter image description here

Best Answer

You are looking at a union, with an elbow to the left and a valve to the right.

Put one wrench on the biggest "nut". Put the other wrench on the smaller "nut" immediately to the right of it - you'll notice both of them are more worn than the other ones.

Hold the smaller one still while unscrewing the larger one.

Here's a cutaway view, if this image link works. From Grainger, no affiliation nor endorsement implied. Down on this image would be right on your image.

enter image description here

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