This 1/4 inch QC would fit a 3/8 inch flared fitting.

Is this reverse thread?

No. The only reverse thread I'm aware of with propane is with the connection at the tank

can you chcarge the tank with this adaptor on?

Not sure what you are asking. This adaptor is so you can connect a hose with quick disconnect fittings to an appliance, stove, lantern, etc. You would disconnect the hose from the tank to fill it. Hope this helps.

Can an auxiliary propane tank be connected to supply the rv with gas; i.e. the reverse of using to supply a bbq?

You don't typically do it that way. You would have to add proper regulator. Item like this is used Marshall Gas Controls MER472 Stay-Longer Propane Adapter Kit , black https://www.amazon.com/dp/B005BNFBIC/ref=cm_sw_r_awdo_navT_g_M51CZ0KKA3YTDV2HYCD1 It's a tee before your reg. I was cheap and just bought hose and disconnect regulator when needed.

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DOZYANT 1/4'' RV Propane Quick Connect Fittings for Connecting Low Pressure Gas Appliance Heater Grill Fire Pit and RV Quick Connect, 1/4" quick key connect plug x 3/8" Female Flare

DOZYANT 1/4'' RV Propane Quick Connect Fittings for Connecting Low Pressure Gas Appliance Heater Grill Fire Pit and RV Quick Connect, 1/4" quick key connect plug x 3/8" Female Flare

Product ID: 190203742

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Details

Size
1/4''
Material
Brass
Brand
DOZYANT
Item dimensions L x W x H
0.5 x 2 x 2
Connector Type
Flare
Thread Size
1/4"

🔥1/4" quick connect plug for instant hookup

🔧3/8" Female Flare for secure, leak-proof fit

⏱️Brass build for durable, corrosion-resistant use

Description

🔥 Connect Fast, Grill Faster — Never Miss a Moment Outdoors!

COMPACT LIGHTWEIGHT - Streamlined 0.5 x 2 x 2 inch design that’s easy to carry and store.
UPGRADE YOUR RV SETUP - Replace old hoses and regulators for a seamless, safer propane connection.
UNIVERSAL COMPATIBILITY - Fits all low-pressure propane appliances including grills, heaters, and fire pits.
EFFORTLESS QUICK CONNECT - Hook up your grill or fire pit in seconds—no tools needed.
PREMIUM BRASS CONSTRUCTION - Built to last with corrosion-resistant brass for reliable outdoor use.

The DOZYANT 1/4" RV Propane Quick Connect Fitting is a durable brass adapter designed for low-pressure propane appliances. It features a 1/4" quick connect plug and a 3/8" female flare connector, enabling fast, secure hookups for grills, heaters, and fire pits. Compact and corrosion-resistant, it simplifies RV propane connections by replacing existing hoses and regulators for a safer, hassle-free outdoor cooking experience.

Specifications

Size	1/4''
Material	Brass
Brand	DOZYANT
Item dimensions L x W x H	0.5 x 2 x 2 inches
Connector Type	Flare
Thread Size	1/4"
Exterior Finish	Brass
Thread Type	NPT
Item Weight	16 ounces
Number of Pieces	1
Manufacturer	DOZYANT
Item Weight	1 pounds
Product Dimensions	0.5 x 2 x 2 inches
Item Package Quantity	1
Batteries Required?	No

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