Your search for "coupler" revealed the following:
N 2019 Festivus Car
Regular price $24.95Why not have a little fun this year with a Festivus Car. Complete with a silver pole. No reason not...
SHS00395 Innsulated Rail Joiners Pkg 24
Regular price $3.00Original SHS parts available in limited numbers.
S Terminal Rail Joiners - Pkg 2 Pair
Regular price $5.00S Scale Terminal Rail Joiners good for Code 138 Rail - Pkg 2 Pair
S Plastic Rail Joiners - Pkg 12
Regular price $4.00S Scale Plastic Rail Joiners good for Code 138 Rail - Pkg 12
N Static Coupler - Long Shank
Regular price $3.00N Scale dummy coupler for T shank gear boxes - Long Shank - Qty 8
N Static Coupler - Medium Shank
Regular price $3.00N Scale dummy coupler for T shank gear boxes - Medium Shank - Qty 8