almost threads in all the way -pic

[robmaxfli]

bought this to thread into my pump but that circular thing at the top is preventing me from threading it more so that the ends but up against each other. do i need a different pvc piece w/out one?

 

[proavia]

It would be better to use hi-temp pump unions similar to these:

Amazon.com

What pump do you have?

 

[robmaxfli]

not sure what pump but here's a pic...so i can't use this piece?

 

[Bperry]

not sure what pump but here's a pic...so i can't use this View attachment 486692piece?

That piece with the circular nub isn’t right for that application, or the piece has a manufacturing defect.