The RCL Series of constant level reservoirs feature a large sight window for viewing liquid level and fluid condition. Furnished with "Oil Level" and line for positive level viewing. Reservoirs can be mounted on the side or bottom. They can be vented to atmosphere or back vented to housing. Standard Features: 1/2 inch NPS female connection 1/2 inch NPTF stud end Temperature & Pressure Ratings Polymer up to 140° F (60°C) Glass up to 180°F (82°C) Ratings are at atmospheric pressure For applications requiring maximum working temperatures of 180°F (82°C) and above, please consult factory