What is it?

[TonyToro Jr. 2,143]

Ok so here is a new one.

We got this in some buckets with some antique RC and die cast cars. It is aluminum and the bottom threads about half an inch and the disc with the 5 bolts moves up and down.

Can anybody identify this? 

[adsm08 3,631]

Do you remember the episode of M*A*S*H when Hawkeye and Trapper were disarming the propaganda bomb that landed in the middle of the compound?

 

That is clearly the part they removed from the tail cone of the bomb.

 

Edited October 12 by adsm08

[WHX?? 52,921]

14 minutes ago, adsm08 said:

removed from the tail cone of the bomb.

Reading way too many comic books there guy... 

I wanna say it's a part for a RC airplane. 

Can I cheat and Google image it??? 

[TonyToro Jr. 2,143]

1 minute ago, WHX?? said:

Reading way too many comic books there guy... 

I wanna say it's a part for a RC airplane. 

Can I cheat and Google image it??? 

Already tried that. Gotten different responses from parts to a submarine to a fitting for a natural gas line 

But give it a try!

[TonyToro 1,133]

27 minutes ago, WHX?? said:

Reading way too many comic books there guy... 

I wanna say it's a part for a RC airplane. 

Can I cheat and Google image it??? 

Yes cheat! Please! We’ve been looking at this for a week! 

[953 nut 62,196]

Looks like a VERY LARGE anti-hammer device used in plumbing systems.

[WHX?? 52,921]

I struck out big time big guy ... I can't even cheat and get it right ... 

[8ntruck 8,157]

Part of a variable pitch propeller hub?

[WHX?? 52,921]

2 minutes ago, 8ntruck said:

Part of a variable pitch propeller hub?

If it is one hell of a small plane or one hell of a RC. 

[Mickwhitt 5,190]

Looks like a mighty nice piece of scrap to weigh in. 

[squonk 44,636]

I was thinking plane prop hub

[JoeM 8,913]

door hinge from a submarine?

 

interlocking gran-a-stand jouint?

[TonyToro Jr. 2,143]

13 hours ago, squonk said:

I was thinking plane prop hub

Now that you say that it kinda makes sense. Still gunna do more digging though

[Bar Nuthin 1,485]

ChatGTP says,

 

That object appears to be a pressure or vacuum relief valve, also sometimes called a breather valve or vent valve, often used on tanks, pipelines, or other pressurized systems.

Here’s why it looks like that:

• The rounded cap on top usually covers a spring-loaded or weight-loaded mechanism that opens when pressure or vacuum exceeds a set limit.

• The large hex nut section allows for disassembly or adjustment.

• The flanged base with bolts is designed for mounting to a tank or pipe connection.

• The metal construction (likely aluminum or galvanized steel) indicates it’s meant for outdoor or industrial use—commonly in fuel storage, water systems, or chemical applications.

If you can share any markings, numbers, or brand names on it, I can narrow down exactly what type and capacity it is. Would you like me to help identify the specific manufacturer or application?

[Bar Nuthin 1,485]

Excellent — that second image helps a lot.

Based on what’s now visible, this part appears to be a type of aluminum pressure/vacuum vent or breather valve for a tank or piping system, likely 2” or 3” flanged size.

Here’s what the bottom view shows:

• The center bore is the flow passage where air or vapor enters/exits.

• The machined lip inside that bore suggests a seat for a poppet or spring-loaded valve disk.

• The outer flange with four protruding studs and nuts is the mounting base—typical of vent valves or flame arrestors that bolt to a tank fitting or nozzle.

• The pinned cover ring indicates it can be disassembled for service or cleaning, which is common in breather/vent valves.

Most likely identification

This looks very similar to:

• OPW 16PB or 16P series aluminum pressure/vacuum relief vents

• Emco Wheaton or Morrison Brothers vent valves (for fuel storage tanks)

• Or a deflagration flame arrestor vent used on storage tanks

They’re often used on:

• Diesel or gasoline storage tanks

• Chemical day tanks

• Hydraulic reservoirs

• Wastewater holding tanks

[WHX?? 52,921]

13 hours ago, JoeM said:

door hinge from a submarine?

 

interlocking gran-a-stand jouint?

I'll have what he's having ... 

 

Jeepers cats Bar you lost me!

Edited October 14 by WHX??

[953 nut 62,196]

10 hours ago, Bar Nuthin said:

appears to be a pressure or vacuum relief valve, also sometimes called a breather valve or vent valve, often used on tanks, pipelines, or other pressurized systems.

I don't see a seat or an outlet for a PR valve, that is why I figured it was a water hammer device that would be mounted at the high point of piping, though I have no idea what it may be.

[Bar Nuthin 1,485]

1 minute ago, 953 nut said:

that is why I figured it was a water hammer device

 

Seems like a perfectly logical observation. 

[TonyToro 1,133]

This has been great! I tried CHAT and took different pictures at different angles and got completely different answers.

 

So now I will tell you what it is……

 

I finally got in touch with the gentleman this came from. He had a very large collection of real cars and Airplanes. Along with all the toys that @TonyToro Jr. received. This was made for an Airplane propeller that he had on display. He said he had a buddy with a machine shop make it so he could mount the airplane propeller on the wall in his office.

 

it’s crazy of all the things we have seen over the years ,sometimes items come up that we can’t identify.  This was great fun! 👍

 

[Mickwhitt 5,190]

Based on the non functioning aspects of the thing, I.e. no sealing faces or rings, bolts with no threads etc it had to be a decorative item. It did look very much like the Hamilton Standard propeller hub on WW2 warplanes.