uncleof6
Active member
The correct way to join PVC is Glue and Primer. Why would want to forgo doing something properly to save no time... and a paltry amount of money.
On top of that., your joints have a much higher tendency to leak if primer is not used.......that's why it's made and mandated under code for residential plumbing.
PVC joined with just glue..... Physical Bond
PVC joined correct w/ glue and primer..... Chemical Bond
If you want to risk leaks and having to cut out plumbing because you don't think you need primer.... go right ahead. I'll spend the extra $2-3$ and do the job correctly, and not have a single worry about a leak.
You can also get clear primer. You might not be able to find it at Home Depot, but it's available.
Glue + primer:
This is not a chemical bond. The primer in no way alters either the chemistry of the pipe or the chemistry of the "glue" The primer merely cleans the pipe, and softens the surface of the pipe. The glue is a solvent, with some solids dissolved in it, that further melts the pipe and fittings. This bond is strictly a physical bond--Chemical Bond denoting a mutual attraction between two atoms resulting from a redistribution of their outer electrons. It is nothing but melted pvc. The primer is only REQUIRED for SAFTEY in pipe diameters of 4" or larger. Correct glueing procedures make good bonds. The primer is unnecessary, for clean unused pipe, and the bond is every bit more than strong enough for the dismal low pressures with aquariums, and it does not have a tendancy to leak, even after 20 years of use. It is technique, not buying more gunk.
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