PARVEEN Chemical Injection Sub, also known as a liquid chamber, is designed to inject inhibitor, chemicals and de-icing agents on to the wireline during routine operations. It is installed below the stuffing box or grease injection control head and used in wells with an H2S environment, dry gas, or conditions which cause hydrate problems. The Chemical injection sub/liquid chamber incorporates a two litre chamber for fluid which is pumped by using a high pressure hand pump. It utilizes replaceable felt packings to coat the wireline and prevent the chemicals from passing downhole. The injection port is equipped with a check valve to prevent fluids from escaping. The design extends wireline and stuffing box packing life and create a smoother wireline operation.