The best replacement for interlock is overlap grip.

The best alternatives to interlock are rated as following:
★★★★★  overlap grip
★★★★  transfer switch
★★★  overlap
★★★  pique
★★★  jersey
★★★  interbond
★★★  mesh
★★★  sst
★★  mesh polo
★★  overlap golf grip
★  mesh fabric
★  accubond
★  double knit
★  stamped concrete
★  core lokt
  sierra pro hunter
  sierra gameking
  cotton mesh polo
  palm rolling
  vardon grip
  tree braids
  palm roll
  nosler partition

Your alternative for interlock is not listed? Suggest!
Speaking about interlock, one probably shouldn't forget about remote start.

Other search terms related to interlock and their ratings are:
★★★★★ remote start
★★★★ circuit breaker
You have in mind a companion for interlock and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of interlock in all years. Click on graph for more.
interlock
overlap grip
transfer switch