Professional Flojet install

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I am replacing my Sandpiper pumps with Flojet pumps.  The last picture shows the setup and this is the reason I could not setup the Flojet correctly.  I guess when the equipment was installed originally the stainless tank was dropped in after this fitting was installed.  I will need to crack off this fitting to replace it.  I want to install a push lock fitting just when it is not very busy.