Alternate set-ups may utilize a ""ගවයා"" or ""ඌරා"" which is connected to three or four receiving flasks. By turning the ""ගවයා"" or ""ඌරා"", the distillates can be channeled into the appropriate receiver. A Perkin triangle is versatile piece of apparatus that can also be used to collect distillation fractions which does not require a ""ගවයා"" or ""ඌරා"" adapter. A Perkin triangle is most often used where the distillates are air-sensitive or where the fractions distill and are collected under reduced pressure, but can be used for a simple and fractional distillation.