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 PIPE PLUG, HEX DRY SEAL 3/4 TAPER, BLACK, ALLOY (INCH)

1/16 SOCKET PIPE PLUG (3/4 TAPER) DOMESTIC
Web Price $2,449.44

USA PIPE PLUG, HEX DRY SEAL 3/4 TAPER, BLACK, ALLOY (INCH)

1/16 SOCKET PIPE PLUG (3/4 TAPER) DOMESTIC
Web Price QUOTE

USA PIPE PLUG, HEX DRY SEAL 3/4 TAPER, BLACK, ALLOY (INCH)

1/8 SOCKET PIPE PLUG (3/4 TAPER) DOMESTIC
Web Price $1,344.92

USA PIPE PLUG, HEX DRY SEAL 3/4 TAPER, BLACK, ALLOY (INCH)

1/8 SOCKET PIPE PLUG (3/4 TAPER) DOMESTIC
Web Price $45.83

USA PIPE PLUG, HEX DRY SEAL 3/4 TAPER, BLACK, ALLOY (INCH)

1/4 SOCKET PIPE PLUG (3/4 TAPER) DOMESTIC
Web Price QUOTE
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 Alloy Steel
Finish N/A Plain
Package Quantity N/A 8000 N/A 100 N/A 5000 N/A 100 N/A 1800