Suction nuts/elbows sit externally and hold the wall fitting to the inside of the bath. The joining pipe work then fits to the nut or elbow allowing the pump to draw water.  
The safety relief port provides an extra level of safety, allowing a vacuum break if suction is obstructed. To operate correctly the Balboa Suction Safety Relief  Adaptor must be installed with consecutive piping. Designed to be used with the Balboa Lo-Pro suction system.

A pressure pipe fitting that provides excellent chemical resistance to most solutions of acids, alkalis and salts and solvents that can be mixed with water. Rated to 230psi/16bar.
PVC pipe and fittings are one of the most widely used materials for pipe installations. Suitable for both indoor and outdoor applications and common place on hot tubs, whirlpool baths, spas and swimming pools. All fittings and pipework have smooth bores which aid in good flow characteristics and resistance to abrasion. PVC is light to handle and can be easily jointed with a simple set of tools, PVC solvent cement and accessories.

• Excellent chemical resistance
• Indoor and outdoor use
• Lightweight and easy to handle
• Compatible with other systems
• Easy to instal
• Conforms to British Standards