Recommended 3/8" Male Flare Propane Bulkhead Fitting
Updated 09/23/2026 | Published 09/22/2026
Products Featured in This Question
Question:
Hello - this bulkhead adapter says its a bulkhead adapter but theres no lock nut shown. Is one included? And how long is the longer threaded part? I need to find something like this to go thru a 3/4inch plywood camper wall + thin aluminum skin, with room for the fitting to attach. I actually need it for 1/4inch propane tubing, so would have to adapt this or maybe you know of a 1/4inch one?. Thank you!
asked by: Bill H
Expert Reply:
Welcome back Bill. The MEC RV Propane Bulkhead Fitting item # MEC84CR does not include a lock nut. I ran down to the warehouse and measured it. The threaded portions are 1-1/8" long and 5/8" long. It's definitely long enough to get through your plywood wall and aluminum skin.
The MEC RV Propane Bulkhead Fitting item # MEC84CR use standard 3/8" 45° flare fittings, which correspond to a 5/8"-18 UNF thread size. Unfortunately, we do not carry a locknut that will work but you'll easily be able to source one that does at a local hardware store.
We do not have a 1/4" Bulkhead Fitting like item # MEC84CR that is long enough to get through the side of your trailer. The Propane Adapter Fitting item # 37207-30225 can be used to connect your 1/4" line though. It has 3/8" Female SAE flare x 1/4" female NPT fittings.
What do you plan on running off of this new propane line you're installing? Feel free to answer this and throw in any other questions you have, where it says Add Comment.
(click to enlarge)
(click to enlarge)
Product Page this Question was Asked From
MEC RV Propane Bulkhead Fitting - 3/8" Male Flare
- Propane Fittings
- Adapter Fittings
- 3/8 Inch - Male Flare
- 3/8 Inch - Female Flare
- MEC
more information >
Continue Researching
- Shop: MEC RV Propane Bulkhead Fitting - 3/8" Male Flare
- Search Results: propane bulkhead
- Shop: JR Products Automatic Changeover 2-Stage Propane Regulator
- Shop: MEC Propane Quick-Disconnect Nipple - 3/8" Male NPT
- Shop: MEC High-Flow RV Propane Pigtail Hose - Stainless - ACME x 1/4" MIF - 15" - Qty 1
- Shop: MEC RV Propane Quick-Disconnect Hose - Female QD x Male QD - 36"
- Shop: Mopeka Pro Check Propane Tank Sensor w/ Magnet for Steel Tanks - Bluetooth
- Shop: Mopeka Propane Tank Monitor - Bluetooth
- Video: Review of JR Products Propane Fittings - 4 Port LP Gas Manifold - JR65CR
- Video: Propane Hose with Back Check Spec Review
- Q&A: Difference Between JR Products Automatic Changeover Propane Regulators & Camco Propane Regulator
- Q&A: Do RV Propane Tank Manifolds Install on Interior or Exterior of RV
- Q&A: Winntec 6020 RV Regulator Replacement Recommendation
- Video: The Low-Down on the JR Products Automatic Changeover 2-Stage Propane Regulator
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams
- Shop: Trailer Hitch
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: trailer tires and wheels
- Search Results: trailer wiring
- Shop: Suspension Enhancement
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Measure for Trailer Hitch Drop
- Search Results: trailer jack
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
on Propane Fittings
