Are there threads on the 3/8 female end?

I left a comment above to someone else who said that this product was 3/8” male and female ends. It is not. I purchased the product and installed it today. It is 3/8” male NPT on one end, and 1/2” female flared swivel on the other. I installed this to complete my upgrade from a single tank to a dual propane system. The 3/8” male NPT threads into the outlet of the new dual regulator, and the 1/2 female flared swivel finished the connection to the main line going into my 2016 Coachmen trailer. The 4 foot hose was more than enough. I could have gotten by with 40” to 42”. Good product, good price.

This hose fits the regulator but not my rv. It’s too big. Is there an adapter I could use?

Hi, There are several adapters to fit different type of connections. The most common ones are 1/4”, 3/8 and 1/2” NPT and there are a couple of different sizes of regulators. I have no way to see which one you have or need, I’m sure if you google the RV specs. LP connector, etc. You will find the correct fitment or adapter to your needs. I wish I could help you more. Good luck!

Just to clarify fitting sizes could you screw one end into the other end?

NO. Thermo Plastic Hose Assembly including a 3/8" MNPT x 1/2" Female Flare Swivel, two different sizes on the ends.

Will the 1/2” female side fit on 1/2 black pipe

The female side is a flare fitting it won’t fit npt threaded pipe without an adapter from npt to flare

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Flame King Thermo Plastic Hose Assembly For LP and Natural Gas, 48 Inch, 3/8 Inch ID - 100383-48, Black

Flame King Thermo Plastic Hose Assembly For LP and Natural Gas, 48 Inch, 3/8 Inch ID - 100383-48, Black

Product ID: 270670174

Details

Brand
Flame King
Colour
Black
Item weight
8.8 Ounces
Material
Plastic
Product dimensions
121.9L x 0.8W

📏48-inch length for versatile RV fit

🔥350 PSI max pressure rating

❄️-40°F to 140°F temperature range

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KD 19.83

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Description

🔥 Connect with Confidence — Power Your Adventures Safely!

HIGH PRESSURE CONFIDENCE - Rated for up to 350 PSI, engineered to handle demanding propane gas systems without compromise.
CERTIFIED SAFETY ASSURANCE - UL569 certification guarantees compliance and peace of mind for propane use.
PRECISION FIT FOR R VS TRAILERS - Seamlessly connects your two-stage regulator to permanent gas piping with a perfect 3/8" ID hose.
DURABLE THERMO PLASTIC CONSTRUCTION - Lightweight yet robust design resists wear and tear, making it the go-to hose for serious RV enthusiasts.
BUILT TO WITHSTAND EXTREME CONDITIONS - Operates reliably from freezing -40°F to scorching 140°F, ensuring safety and performance year-round.

The Flame King 48-inch Thermo Plastic Hose Assembly is a UL569-certified, high-pressure (350 PSI) propane hose designed specifically for RVs and travel trailers. Featuring a 3/8" inner diameter and durable thermo plastic construction, it reliably operates in extreme temperatures from -40°F to 140°F, ensuring safe and efficient connection between two-stage regulators and permanent gas piping systems.

Specifications

ASIN	B00IZCNN9U
Best Sellers Rank	#197,306 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #657 in Plumbing Tubing & Hoses
Brand Name	Flame King
Color	Black
Country of Publication	China
Customer Reviews	4.6 4.6 out of 5 stars (1,423)
Global Trade Identification Number	00899003000854
Included Components	48 Inch Thermo Plastic Hose 3/8 Inch
Item Dimensions L x W	121.9L x 0.8W centimeters
Item Length	48 Inches
Item Type Name	48-inch Propane Thermo Plastic Hose Assembly, 3/8-inch ID, 3/8-inch MPT X 1/2-inch Female Flare, for RVs and Travel Trailers
Item Weight	8.8 Ounces
Manufacturer	Flame King
Material Type	Plastic
Maximum Pressure	350 Pound per Square Inch
Nominal Wall Thickness	0.5 inch
UPC	899003000854
Unit Count	4 Feet

Reviews

C**E

Tuyau flexible 3/8" diamètre intérieur avec un connecteur mâle 3/8" MNPT d'un côté et de l'autre femelle 1/2" Flare pivotant. Je l'ai utilisé pour ma génératrice au propane. Aucune fuite.

21.04.2025

C**S

This hose worked out great it fit perfectly.

8.02.2026

M**S

Exactly what we needed when a critter chewed through the line on our camper. Fixed it ourselves with this and likely saved tons in labor costs had we taken it in to get fixed.

1.12.2025

G**S

Conecting to our fifth wheel was easy

1.06.2025

K**L

Perfect length send seem high quality

31.05.2025

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