gas - Dryer calls for 1/8 NPT plug - why not just direct

Any ideas why this dryer gas connection diagram calls for the "1/8" NPT Pipe Plug" - why isn't it just calling for a direct connection to the gas supply instead of having something t

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Suitable for the outer diameter of the pipe:1/4 5/16 3/8 1/2 . Product Material: Brass. Used with plastic and copper tubing. Package Include:60PCS

180PCS Tube OD（1/4 5/16 3/8 1/2) Brass Compression Sleeves Ferrules,4 Sizes Brass Compression Fitting Assortment Kit

Including sewer jet hose, laser sewer jet nozzle (button nose), rotating sewer jetting nozzle, M22 female to 1/4 inch female NPT coupler and 1/4 inch

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Dryer gas hookup details - thoughts on why this diagram calls for a 1/8 NPT Pipe Plug which T's off rather than just connecting directly to the gas supply with some straight

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These gas connectors are corrugated and flexible, so they can be bent even in tight spaces. Heavy duty stainless steel. Easy and quick installment.

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