Standard Solvent Recycling Adapters for S373-type Filters (13/16-16)


SKU: S37SA Category:


This is a standard Solvent Recycling/Trap Adapter for the S373 series Oil Filters. It fits many others with the same 13/16-16 threads.

These have knurling and wrench flats for a 13/16 crescent wrench.

Stainless Adapters have a medium-grey, uniform, matte finish. Much darker than the stock photo above suggests.

4140 Chromium-Molybdenum Steel (not Aluminum or low-carbon steel) Adapters get sandblasted, then, they’re Manganese Phosphate Parkerized. Please note that Parkerizing color and consistency are directly related to the metal surface and cannot be completely controlled. It’s a minor trade-off for the superior protection and durability.

This is not Black Oxide coated. 1) There are several different kinds of “black oxide” coating, most of which truly and deeply suck. Do you know the difference? Were you even told which it is? Maybe there’s a reason “they” don’t want to talk about it, eh? You’re better off with tumbled stainless, or a black crayon, than any of the “black oxide” finishes I’ve seen on supposedly competing products. I don’t do it. There are reasons. 2) Parkerizing is not a coating, it is a micro-crystaline structure which grows out of the surface of the metal. Duracoat is good. Duracoat on top of Parkerizing is effing amazing. Just about any paint-like product applied over Parkerizing is made an order of magnitude better by the “grip” it lends. Even flat black rattle can spray paint becomes good stuff on top of Parkerizing. Of course, Parkerizing is damn fine by itself, too.

NOTICE: When you receive your Parkerized adapter, be sure to wipe it down well and apply a liberal (eewww, liberals, gross!) coating of oil. It will be thirsty! The corrosion resistance of Parkerized materials is dependent upon the micro-crystalline structure sponging-up oil. WD-40 makes an excellent anhydrous initiator, and you probably already have some. It’s not the ideal long-term solution, but it’s great in the beginning and likely handy. You’ll undoubtedly find some “gunk” on it and in the threads by the time it arrives. The oil often displaces “gunk” as it soaks in, just wipe it down and re-oil it. After a day or two of that, it’ll be fine. Parkerizing flat surfaces is much easier than threads and crevices, there may be more gunk than you’re used to.

1/2-28 Threads are freakin’ everywhere. There are tons of guns/barrels with these threads. Way too many to list. Most USA Firearms 9mm and under have these.

1/2-36 is most common on USA-made 9mm ARs. Not very common on anything else.

M13.5x1LH is a thread found on many non-USA threaded 9mm handguns. Euro guns tend to be even less standardized, so, it may fit many others.

M14x1LH is the most common thread for AKs.

M14x1RH is found on some SKSes and quite a few 7.62 chamberings from Yugoslavia. Weirdos…

You will not find my products on eBayTM or AmazonTM, nor do I accept PayPalTM. Why? These organizations donate tons of money to anti-gun lobbyists. If you conduct business with these organizations, you are donating your money to gun control.

These support a standard washer for 3/4in bolts. You can get them at any hardware store or home improvement store. Washers are optional and not included because they are only useful when using the adapter/filter as a storage canister. Most people pour back back and forth a few times to filter a few passes and then back into the original container.

You are buying a Thread Adapter. Nothing but the adapter is included.

You can probably find cheaper, but you’ll get what you pay for. There is a difference between affordable and half-assed.

WARNING: There is a fine line between Solvent Trap and Illegal Silencer. While it seems like a cool, simple, cheap, common-sense thing to do to reduce noise pollution and protect your hearing without the crazy safety risks created by earmuffs, it is, in fact, illegal to make a silencer or suppressor from a filter, or anything else, for that matter. Holy run-on sentences, Batman! Solvent recycling device, legal. Unregistered silencer, illegal. Getting a Filter Suppressor registered on a Form 1 is unclear and may not even be possible for non-SOTs. The ATF has provided conflicting information. You’ve been advised.