Larger PVC pipes are used in water run off/ drainage. Generally speaking, they are not designed to be water tight.
Alright Tab, as the professional dissenter, I know your opinion won't change regardless of facts or experiences from anyone.
Anyway, here's an expert from the Free State Project in New Hampshire named Cope Reynolds, regarding long-term gun storage.
LONG-TERM GUN STORAGE
A question I get asked frequently is, “How do you suggest I store firearms and ammunition in such a way that I would not lose them in the event my house burned down or was broken into or Uncle Sugar wanted to come get them for one reason or another?”
One way is to buy one of the waterproof containers available almost everywhere (and cost too much), slide your gun into a rust-proof storage bag, put it in the container, then bury it somewhere. The method I recommend, however, works just as well and will protect your guns indefinitely.
Buy as much 8-inch PVC pipe as you need from a water/sewer materials distributor. Eight inches in diameter is larger than you will find at any hardware store. Get the kind of pipe designed for handling sewer water rather than fresh water (ask for SDR35). The water pipe works fine, but is unnecessarily heavy and expensive. There are three kinds of caps you can get to seal the ends. One kind is glued on and is permanent, but if you’ve never installed pipe before, it’s easy to miss a spot with your glue and thus allow for leakage. Another kind of cap is rubber gasketed. To use these, bevel the pipe back about 3/4 of an inch with a rasp or grinder, smear an even coat of lubricant on the pipe end (any kind of liquid soap will work), then slip the cap on. If done correctly, the seal will be absolutely 100% air and water tight. The third kind of cap uses a glue-on adaptor with a screw-type plug. You just glue the adaptor to the pipe end and the plug screws in to it. But these are unnecessarily expensive and just about impossible to remove without a BIG wrench. In my opinion, the gasketed caps are the best choice because to remove them, you can hold the pipe between your legs and kick them off or use a rock. No tools are required. To put them back on the pipe, just use a little liquid soap as you did the first time. You should have room for two long guns, a couple of handguns, and a little ammo for each in a 4-foot section of 8-inch pipe. Since scoped rifles, rifles with fixed mags, and even some open-sighted rifles with a lot of drop in the stock may not fit into a 6-inch pipe, spend just a little more and buy the bigger 8-inch stuff.
Now that you have your pipe prepared, clean your guns as you normally would, leaving a very light film of oil on them. Forget cosmoline or heavy grease; Break-Free is my preference. Slip each gun into a breathable case, then put it into your pipe. To make an effective dessicant, put some crushed sheetrock or kitty litter on a cookie sheet and bake it at 300 degrees for about 30 minutes. Fill a sock half full with your homemade dessicant, tie it off, and put it in the pipe. (If you don’t like the homemade method, you can always go spend a bunch of money on special dessicants that some people say you just can’t live without.) Before sealing, keep the pipe in the house for a day or two to make absolutely sure that the interior is as dry as it can be. This is especially important if you live in a humid climate.
Bury the sealed pipe somewhere away from your house, preferably half a mile or more depending on the population close at hand. If possible, bury it vertically in order to present a smaller target for metal detectors and ground penetrating radar. If you must bury it close to your home, try to place it parallel to metal pipelines, under the edge of a metal-reinforced concrete slab, under a fence post, etc.
He provides three options for sealing, and gasketed are better, but the PVC works fine.
Have a good one Tab, can't have everyone agree all the time, than things become monotonous.
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