Material: The pipe connectors are made of injected plastic, strong, durable and long service life. Size: Suitable for pipes with an inner diameter of 13 mm and an outer diameter of 16 mm, suitable for most pipes. Contents: 8 x 16 mm tees; 8 x 16 mm elbows; 8 x 16 mm straight nipples; 8 x 16 mm end caps; 2 x 16 mm through valves. Easy to use: The pipe connectors can be easily installed without any additional tools. Fits most 1/2 inch tubing approximately. 520 ID range, high-impact plastic construction, ideal for garden greenhouse, flower bed, patio, lawn.