Motor Vehicle Maintenance & Repair Asked by zaen on March 14, 2021
I’m researching paint guns and came across the DeVilbiss 802342 kit. I noticed though that it has 1/4" NPS threads, even though I’ve only ever seen NPT used for air plugs. A quick search indicates that these types of threads will engage, but won’t seal properly. No sources seem to say whether or not this can be fixed with thread tape/dope, only that thread tape/dope is required for NPT connections. One other source I found said that generally NPT is used for air connections and NPS for fluid connections, although the DeVilbiss website specifies that this is for the air connection.
Looking at various websites, I can’t find a 1/4" NPS air plug anywhere, even McMaster-Carr. I’ve never paid much attention to the fittings on my air tools, just checked whether they were male or female threaded and put a 1/4" NPT plug on there. Is it common for air tools to have NPS threads on the tools themselves? Will a NPT plug work with NPS threads (assuming proper thread sealant is used)?
I was able to find the answer, finally.
To the question of whether or not NPS threads are common on air tools, the answer is they appear to be uncommon on everything but paint sprayers. However, the only NPS fitting I've been able to find after a couple of hours of intermittent searching I've only found a single NPS fitting, made by the DeVilbiss.
DeVilbiss makes a line of proprietary "high-flow" fittings that don't appear to be compatible with normal air hose fittings, so they require buying both a plug and a socket. While the majority of these are NPT, they make a single model of NPS female threaded plugs specifically for their spray guns. Annoyingly, that means buying a dedicated hose for the paint gun too, since the rest of my (and I would assume almost everyone's) air system doesn't use proprietary DeVilbiss fittings.
One user on Amazon reports that he's used "a standard air fitting," presumably NPT, in place of one of these for years without a problem. As non-authoritative as that source is, it's the only information I've been able to find.
Answered by zaen on March 14, 2021
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