The Parveen Model 'L' sliding sleeve is a downhole tool used to establish communication, when desired, between the tubing and annulus. Selective and or top no-go locking devices are available for use with the sleeve. It has seal bores above and below the ports, and a top no-go shoulder and locking groove.

The "L" sliding sleeve locates, seals and retains flow control accesories that have either top no-go or selective locks.

Parveen Model "L" sliding sleeve is manufactured for standard, H₂S and H₂S-CO₂ service.