I have a cast iron sewer cleanout in my front yard that I want to lower by a couple feet due to landscaping. Can I just cut this with a grinder and use a Fernco adapter to attach a new PVC cap housing on? Is there a metal solution? Thanks for ideas.

Sure just cut it. The have a metal vented cap with side screws if you want metal to metal Eliminates fern co etc. Where the old cap?

Signed 21 Boat

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Yes, you can buy Cast Iron "Blind End Cap". Cut of the pipe as you wish, install Fernco coupling, slip the cap into the other end of coupling, and tighten.

Am I missing something here? Mr. Butler's asking about a sewer main cleanout, (see image) and you guys are treating it like a septic tank vent and advise him to cap it.(see image)
My advice? Cut the cast iron off a few inches underground and install a clean out cover using a shielded metal coupling,(see image) good luck and thanks for rating my answer. Tom