Uthai Kailas (Thai: อุทัย ไกรลาศ), known professionally as Kangwannoi Or.Sribualoi (Thai: กังวาลน้อย อ.ศรีบัวลอย), is a Thai former professional Muay Thai fighter.
He is a former Lumpinee Stadium Bantamweight Champion who was active during the 1980s and 1990s.
He is also the younger half-brother of Saenklai SitKruOd, another famous fighter.
[1] He trained at the SitKruOd gym alongside his brother, Saenklai SitKruOd.
[2] He fought during the Golden Era of Muay Thai against many notable fighters including Wangchannoi Sor.Palangchai, Boonlai Sor.Thanikul,[3] Dokmaipa Por.Pongsawang,[4] Rajasak Sor.Vorapin, Taweesaklek Ploysakda,[5] Padejseuk Kiatsamran,[6] Yodpetch Sor.Jitpattana, M16 Bor.Khor.Sor.,[7][8] and Nuengthoranee Petchyindee.