A dry seal plug is one having a tapered (3/4" diametral per 12") thread extending its entire length and designed to have its threads mesh tightly with those of a taper-threaded hole.  A flush type plug is one having a tapered (7/8" diametral per 12") thread extending its entire length and designed to provide a flush condition with a standard tapped hole
Unit of Measure
Items
USA BRASS PIPE PLUG, 3/4 TAPER, PLAIN (INCH)

1/16 SOCKET PIPE PLUG (3/4 TAPER) BRASS DOMESTIC
Web Price $4,012.26

USA BRASS PIPE PLUG, 3/4 TAPER, PLAIN (INCH)

1/16 SOCKET PIPE PLUG (3/4 TAPER) BRASS DOMESTIC
Web Price $65.21

USA BRASS PIPE PLUG, 3/4 TAPER, PLAIN (INCH)

1/8 SOCKET PIPE PLUG (3/4 TAPER) BRASS DOMESTIC
Web Price $4,261.82

USA BRASS PIPE PLUG, 3/4 TAPER, PLAIN (INCH)

1/8 SOCKET PIPE PLUG (3/4 TAPER) BRASS DOMESTIC
Web Price $110.78

USA BRASS PIPE PLUG, 3/4 TAPER, PLAIN (INCH)

1/4 SOCKET PIPE PLUG (3/4 TAPER) BRASS DOMESTIC
Web Price $3,283.04
Diameter N/A 1/16 N/A 1/16 N/A 1/8 N/A 1/8 N/A 1/4
Pitch N/A
Length N/A
Material N/A Brass
Finish N/A Plain
Package Quantity N/A 8000 N/A 100 N/A 5000 N/A 100 N/A 1800