Why won't this 3/8 male connector for a natural gas dryer fit a 3/8 female connector? - Home Improvement Stack Exchange

DOZYANT 3/8 Inch Natural Gas Quick Connect Fittings

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Tsinghwang 3-way 3/8 x 1/2 Tee Adapter Brass 3/8 Water Line T

3/8 Inch Natural Gas Quick Connect Fittings, LP Gas

Faucet Connector Hose, UPC Approved Braided Stainless Steel Faucet

LASCO 17-5855 5/8-Inch Female Flare by 1/2-Inch Male Flare Brass

LASCO 17-5855 5/8-Inch Female Flare by 1/2-Inch Male Flare Brass

plumbing - Safety of swapping natural gas grill quick connect

The Plumber's Choice 1/2 in. OD x 3/8 in. ID Flexible Gas

Eastman 1/2 Inch FIP x 3/8 Inch Compression Flexible Faucet