Product Name: Over 20 Years Experience Factory Supply High Quality Level Joining Sight Glass Model NO.: 1/4---1/2 Flare Tube: Thread Trademark: hengsen Transport Package: Carton Specification: 1/4-----7/8 Origin: China Zhejiang Zhuji HS Code: 8481804090 Product Description Zhejiang Hengsen Industrial Group Co.,Ltd are a leading, professional exporter of fittings for refrigeration fittings, HVAC controls products, auto air-conditioner fittings, copper fittings, and disperse pipes in china. And we have been about 20 years experience. We will provide the best products and service for you.We are able to produce all kinds of goods in accordance with your special OEM/ODM requirements.You may send inquiry to Susan for more products information or OEM details, Thanks!Function Introduction:Conventional sight glass is used on the liquid line of refrigeration and air conditioning equipment. It indicates flow condition of refrigerant, water content of refrigerant, and the flow condition of lubricant oil in the oil return line of oil separator.