" Tip #20:Installing a Threaded Fitting"
Anytime you connect two items, you have the choice of a chemical or mechanical bond.
To insure a water tight connection between a PVC fitting and PVC pipe, you use a chemical bond and glue them together with PVC cement.
But how do you get a secure connection when you're dealing with PVC pipe and an incompatible material like the stainless steel of a filter canister that doesn't play well with chemical adhesion?
You connect unrelated materials by using threaded fittings in a mechanical bond.
The danger here is that PVC is flexible and the item you're connecting it to is often not. As you tighten PVC, the socket can distend or flex out of round to where a pipe stem can't be inserted.
The solution? Insert a small section of appropriately sized pipe into the socket before you tighten a fitting to prevent it from deforming its perfectly round shape.
Tip #22 (above) shows you how to prevent messing up the socket end of a fitting.
So, what happens when you mess up the threaded end?
PVC is not only a flexible material, it's also quite soft. When you don't have the angle quite right and begin threading a fitting into a metal socket, it's the PVC threads (either male or female) that suffer. Crossed threads are not water tight and threaten the integrity of your installation.
To repair, you need to straighten out the theads without cutting through them.
How is this done? Like most things, a simple trick of the trade is the answer.
Yes, you're seeing that correctly. Hold the hacksaw backward and, starting from the inner most crossed thread (because it's easier to parallel undamaged threads), lightly brush the blade through each groove. You're not trying to cut into PVC, you're simply realigning the threads to their original angle. You could also use the sharp edge of a small file.
And in the worst case where threads are simply mangled beyond repair, move the hacksaw blade up to the first good thread and cut the end of the fitting straight across.
Neat ideas? Our
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