Lingxiao LX 56WUA Pump 4.0 HP Wet End (56WUA400B IIWE) unions The Waterco 1 1 2" Micron Series The Waterco 1 1 2" Micron Series SM 500 & 600 Multiport Valve is a practical replacement option for service work where the correct fit matters as much as the repair itself The Val Pak 1 1 2 inch MPT spring return line check valve in dark gray is designed for compatible spa plumbing applications where controlled one way flow is needed on the return side Supports dependable repair on a strong selling LX pump platform This replacement matters because best selling Lingxiao LX pumps benefit from dependable support parts that keep them repairable rather than disposable