By-pass valves offset type COCK with stuffi ng box and smooth nipple, for orientation the glass with respect to connections, 90° operation permits immediate opening/closing, for REFLEX or TRANSPARENT level glass type. Simple design (only one moving part) ensures uninterrupted operation. The packing sleeve, the only part subjected to wear, can be replaced within minutes with cock remaining in line Valve bore 8mm for shut-off and bore 6mm for drain. Temperature range -100°C to +400°C, in function of the type of material.