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AP MEJ400 Brass Liquid Level Vent Valve 1/4" NPT Propane

Manufacturer

AP

<h3>About AP Products</h3><p><strong>AP Products</strong> has been a cornerstone of the recreational vehicle industry for over three decades. Founded in 1994 by Tom Manning Sr. — with roots going back to 1992 — the company began with a straightforward goal: offering a complementary line of packaged screws to support an existing supplier relationship. What started as a niche hardware offering has since grown into one of the most comprehensive RV replacement parts portfolios in North America.</p><p>Headquartered in Coldwater, Michigan, AP Products serves both the OEM and aftermarket segments of the RV world. Their catalog spans everything from adhesives and sealants to electrical components, braking systems, doors, locks, seals, and slide-out parts — making them a true one-stop source for RV dealers and enthusiasts alike. The company operates a group of 13 brands, focused on bringing high-quality, often American-made products to market and filling gaps that other suppliers have overlooked.</p><h3>A Broad Product Range Built Around RV Life</h3><p>One of AP Products' most recognized product segments is <a href="/2843-ap-body-trim-molding-46915">body trim molding</a>. Whether you&apos;re restoring a sun-faded travel trailer or refreshing a Class A motorhome, AP Products offers aluminum insert trim molding in a range of finishes — including Polar White, Colonial White, Black, and Mill Finish — designed to fit securely and deliver a clean, factory-like appearance. These trim solutions are made in the USA and backed by a limited warranty.</p><p>Lighting is another area where AP Products shines. Through their StarLights sub-brand and their broader electrical lineup, AP Products offers a wide array of <a href="/2843-ap-driving-light-bulb-16367">driving light bulbs</a> and RV-specific lighting solutions. From LED replacement bulbs engineered to fit standard RV fixtures to specialized omnidirectional tower bulbs, their lighting products are designed to deliver reliable performance and energy efficiency for life on the road.</p><p>Beyond trim and lighting, AP Products&apos; electrical category is expansive — covering adapters, circuit breakers, converters, power centers, energy management systems, awning accessories, and more. Their hardware line covers both exterior and interior needs, from compartment hardware and screw covers to cabinet hardware sized to fit travel trailers, fifth wheels, Class A and Class C motorhomes, and toy haulers.</p><h3>Trusted by RV Dealers and Owners Nationwide</h3><p>AP Products has built its reputation not just on product breadth, but on a genuine commitment to supporting the dealer network. The company has managed dozens of national retail and OEM accounts, and their parts are stocked widely to ensure availability when and where RV owners need them most. Quality is monitored continuously throughout production, reflecting a brand philosophy centered on reliability over the long haul.</p><p>Whether you&apos;re a seasoned full-timer, a weekend camper, or an RV service technician, AP Products delivers the parts and confidence to keep any rig road-ready.</p>

Part Number

MEJ400
07/13/2036 3:52 AM
Sale Price

$13.03

In Stock (10+)

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Product Details

The AP MEJ400 is a brass liquid level vent valve designed for propane and LP gas systems in RVs, trucks, and industrial applications. This standard vent valve helps operators safely detect liquid levels when filling propane tanks and effectively bleed down connections before disconnecting transfer lines.

Key Features:

  • 1/4 inch Male NPT connection for easy installation
  • All-brass construction for durability and corrosion resistance
  • Standard #54 orifice size minimizes product loss during operation
  • Knurled stem completely unscrews from valve body for easy stem replacement
  • Compatible with Marshall Excelsior globe valves (ME815-X series) and angle valves (ME825-X series)
  • Installs into downstream auxiliary port on transfer valves
  • Made in the USA

How It Works:

Install the vent valve in the vapor space of the tank. Open the valve before filling begins to allow vapor discharge. When the tank reaches maximum liquid fill capacity (80% of tank capacity), liquid will begin to discharge from the vent valve, indicating the tank has reached safe fill capacity. The valve also verifies that transfer system valves have closed properly—opening the vent valve until liquid or vapor stops venting indicates it is safe to disconnect.

This is the standard emission version. For reduced emissions, consider upgrading to the low-emission or self-cleaning models. The MEJ400 is also known as Propane Vent Valve #72 in some applications.

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the product reviews all seem to be reviewed of autoplicity's service instead of the item being viewed. either way, the shocks ordered were the right ones w/ all the parts w/ it. autoplicity's item descriptions could be a little more clear and/or explicit like specifying which side a part applies to instead of just &quot;passenger or driver&quot; side, or &quot;can be used in either said&quot;

easy order. love how you can checkout with amazon

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One of the simplest orders I have placed for autoparts. Well done

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