Question about fitting male adapter into backup sump pump

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Nav78

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Hello I am trying to install the Wayne battery backup sump pump.


The pump has 1.5 inch NPT discharge which is made of metal (female side)

I bought this PVC male adapter to screw into the metal female discharge.

https://www.menards.com/main/p-1444449159934.htm

I am unable to hand tight the adapter more than a single thread or two. It just becomes extremely tight and I am afraid I will strip the thread if I apply more force. Is this normal?

What am I missing? Should I buy a different brand adapter? Did I buy the wrong adapter? Is it supposed to screw only a couple of threads before I use a wrench?

I have tried using plumbers tape on the male adapter and it did not help.
 

John Gayewski

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This can be a thing that has you cursing for hours. Try a different brand, but it's likley you just need to hold your tongue right.

This happens to me every couple of years. You'll know when toy finally get in.
 

Nav78

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Thanks John. What do you mean by “hold your tongue right”. Do you mean just hold the mAle and female sides straight and try a few times?
 

John Gayewski

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It's a quip. Meaning it's beyond your control something isn't perfect. Try to loosen your grip. That helps me sometimes let the threads do the steering.

Me and another guy tried to screw a coupling onto a metal sink base one time. We each tried for about a half an hour each. We ended up walking away from it for a while and came back and it went right in. We weren't holding our tongue the right way.
 

Nav78

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lol sorry didn’t get that at first. Appreciate your patience and response. Thank you again!
 

Reach4

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I expect that the threads on your pump or your adapter are deficient/improper. You could inspect for flaws. Maybe drag a sharp tool, such as a scribe or jewelers screwdriver thru the grooves on the female connection on the pump.

Also, using pipe dope will consume less space vs tape. It's a small thing.

A 1.5 inch npt tap could chase the threads on the pump.

 
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