Connections, fittings, and adapters

You need a 1½" male-threaded barb adapter with a stepped 32/38 mm barb, made of PVC or engineering-grade ABS. This fitting screws directly into the suction nozzle and lets you push on the floating hose, ensuring a watertight seal through mechanical tightening.

To ensure a watertight connection under continuous suction, follow these steps:

• Apply 6 to 8 turns of PTFE Teflon tape to the male thread clockwise to seal the tapered seat.
• Insert the 38 mm flexible sleeve all the way onto the ribbed tapered barb.
• Secure the hose with a stainless steel clamp to prevent air from entering when the pump loses prime.

If your system includes accessories such as the AR100 skimmer + return nozzle assembly, this type of ribbed terminal is the exact standard for connecting cleaning hoses without any looseness.

Choosing the right parts requires checking the connection type, connection size, and gasket material. For rigid underground pipework, use pressure-rated PVC with a minimum PN10 rating, joined with rigid PVC adhesive after applying cleaner to both surfaces.

For threaded connections, use Teflon tape or polyamide thread sealant on plastic threads, avoiding putties that are incompatible with polymers. Removable parts located next to valves require unions with a swivel nut and an EPDM O-ring, and you should avoid overtightening them with heavy wrenches to prevent cracking the support flange.

You should purchase combination transition fittings with a 2" BSP male thread at one end and a 50 mm female solvent-weld socket at the other, optionally combined with a bushing or reducing coupling. This fitting bridges the change in diameter without restricting the flow recirculating toward the filter bed.

On filtration components such as the 2" 6-way selector valve (SP0715X62E), the threaded ports accept 2-inch male-thread adapters to connect the return and waste pipes with quick-drying glue. Adding a three-piece union to each port makes it easier to remove the valve for future repairs without cutting the existing pipes.

A three-piece union has a removable center nut with a watertight O-ring, whereas a simple coupling is a smooth cylindrical sleeve permanently glued at both ends. A detachable union lets you separate pipe sections without sawing through the plumbing, and is essential next to pumps and chlorinators to make them easier to remove for winter.

By contrast, a straight coupling is used in continuous straight runs or buried sections where no future mechanical maintenance is expected. A plain socket costs less per unit, but a detachable union saves hours of labor in the event of a motor failure.

Install two three-piece unions with external male threads and internal solvent-weld sockets directly at the motor’s suction inlet and discharge outlet. This configuration lets you loosen the union nut by hand and remove the pump housing in five minutes without spilling the water inside.

For equipment with threaded connections, such as the Winner 0.5 HP Single-Phase Pump, use a detachable union fitting with an integrated EPDM seal. The O-ring absorbs vibrations from the electric motor while running, prevents cracks in the outlet elbows, and maintains hydraulic tightness after repeated assembly and disassembly cycles.

Fittings for saltwater systems must have a minimum nominal pressure rating of PN10, equivalent to a continuous working pressure of 10 bar at 20 degrees Celsius, and be made of virgin, non-recycled PVC-U. This synthetic material tolerates salt concentrations of up to 7 grams per liter and the constant production of sodium hypochlorite without galvanic corrosion.

Make sure the seals are made of EPDM synthetic rubber, not natural rubber or conventional NBR, as the combination of salinity and ultraviolet radiation degrades basic elastomers, causing constant drips. Certified plastic fittings withstand peak pressures during sand filter backwashing without risk of breakage.

You need to fit a 32 mm hose-tail to 1½" male-thread adapter together with a glued reducing coupling from 50 mm diameter to 1½" female thread. This connecting link allows you to transition from the soft corrugated hose in the pool to the rigid PVC pipe in the equipment shed.

To complete the installation securely, follow this three-part diagram:

• Fit the hose-tail connector inside the 32 mm flexible hose and secure it with a blind-tightening metal clamp.
• Screw the 1½" end into the female adapter, applying 8 turns of PTFE Teflon sealing tape.
• Glue the 50 mm end to the rigid PVC pipe using rigid PVC adhesive after chemical cleaning.

This fitting maintains constant suction pressure without restricting the nominal flow rate required by the pool pump.