The Type "LGU" By-Pass Choke is a Top No-Go Device which is run on wireline and designed to be landed and set in the Type "L" Sliding Sleeve ideally suited for commingled production. The By-Pass Choke is equipped with a ceramic flow choke which controls the flow of the zone being produced through the Sliding Sleeve. Production from the other zone flows thru the bypass, but is prevented from back flowing through the choke and the Sliding Sleeve by an API ball and seat back check valve.