Suitable size: the pool nozzle has a 3/4" opening and a 3/4" thread to fit 3/4" PVC pipe, which can also be adjusted and locked in place with an external locking ring. Convenient Features: Spa massage nozzle is convenient to use. The flow inlets are fully adjustable and flow directly into most areas of the pool, providing the proper circulation pattern. High Quality Material: The pool eyeball nozzle is made Made of high quality PVC, which is well made, safe, durable and corrosion resistant. High Performance: The swimming pool massager eyeball nozzle has high performance with quality control standards strict. Directional water flow inlet fitting that allows speed and flow control. WIDE APPLICATIONS: Spa Eyeball Jet Nozzle is a good replacement for pool outlet nozzles, fittings standard return pool directional drains and swimming pools.