There are several types of Wipperman chain connectors.
For IG8: This Wipperman chain connector is nickel plated, measuring 12.2mm wide, and it installs by a spring-clip style. That is to say, no tool chain connector is required. It's 1/8 pitch 1G8 for BMX/Grind chains
#11 (Star chains): nickel plated, 9.2mm wide spring-clip style, no tool chain connector for 1/8 star series, works for 1-speed chains
IntraX: again nickel plated, this time 7.8mm wide snap-on style, intended for 3/32 IntraX chains
6-8 speed: stainless steel and measuring 6.8mm wide, no tool chain connector required, for 3/32 Wipperman chains
9-speed: at last, a stainless steel version, width 6.5mm, no tool chain connector, sized for 11/128 Wipperman chains
C-10sp: stainless steel again, 6.2mm wide, no tool chain connector as always, and meant for Campagnolo
compatible 11/128 chains
S-10sp: stainless steel, just 6.1mm wide, no tool chain connector, one of the most popular connectors since it's intended for Shimano
compatible 11/128 chains.