A gas injector (50, 90) for injecting processing gas into a hot zone of a vertical furnace between a tower supporting multiple wafers and a tubular liner, the gas injector (50, 90) comprising: a tubular straw (52, 92) defining a first bore (58, 98) extending along a first axis of the tubular straw (52, 92) from a first distal end to a first proximate end, the tubular straw (52, 92) made of a first material selected from the group consisting of silicon and silicon carbide; and a connector (70, 104) detachably connected to and in fluid communication with the first bore (58, 98) of the tubular straw (52, 92), the connector (70, 104) made of a second material being different than the first material, the connector including a supply tube (66, 100) defining a second bore extending along a second axis of the supply tube, the second axis being substantially perpendicular to the first axis, the connector (70, 104) being constructed and arranged to (i) receive the processing gas from a gas supply line at a second distal end of the supply tube (66, 100), and (ii) deliver the processing gas to the tubular straw (52, 92) from the supply tube (66, 100); characterized by: at least one clamp (74, 76, 106, 108); and a screw (78, 80, 114, 116) threaded through each of the at least one clamp (74, 76, 106, 108) and into the connector (70, 104), wherein the screw (78, 80, 114, 116) is configured to be tightened to hold each clamp (74, 76, 106, 108) against the tubular straw (52, 92), thereby holding the tubular straw (52, 92) in fluid communication with the supply tube (66, 100). a tubular straw (52, 92) defining a first bore (58, 98) extending along a first axis of the tubular straw (52, 92) from a first distal end to a first proximate end, the tubular straw (52, 92) made of a first material selected from the group consisting of silicon and silicon carbide; and a connector (70, 104) detachably connected to and in fluid communication with the first bore (58, 98) of the tubular straw (52, 92), the connector (70, 104) made of a second material being different than the first material, the connector including a supply tube (66, 100) defining a second bore extending along a second axis of the supply tube, the second axis being substantially perpendicular to the first axis, the connector (70, 104) being constructed and arranged to (i) receive the processing gas from a gas supply line at a second distal end of the supply tube (66, 100), and (ii) deliver the processing gas to the tubular straw (52, 92) from the supply tube (66, 100); characterized by: at least one clamp (74, 76, 106, 108); and a screw (78, 80, 114, 116) threaded through each of the at least one clamp (74, 76, 106, 108) and into the connector (70, 104), wherein the screw (78, 80, 114, 116) is configured to be tightened to hold each clamp (74, 76, 106, 108) against the tubular straw (52, 92), thereby holding the tubular straw (52, 92) in fluid communication with the supply tube (66, 100). at least one clamp (74, 76, 106, 108); and a screw (78, 80, 114, 116) threaded through each of the at least one clamp (74, 76, 106, 108) and into the connector (70, 104), wherein the screw (78, 80, 114, 116) is configured to be tightened to hold each clamp (74, 76, 106, 108) against the tubular straw (52, 92), thereby holding the tubular straw (52, 92) in fluid communication with the supply tube (66, 100).