
Quick overview
- Genuine Waterway Factory part number 519-7441.
- Holds the gauge The lock-nut is what secures the pressure gauge in place on the filter.
- Clearwater II Listed for the Waterway Clearwater II cartridge filter and the Clearwater II DE filter.
- Cheap part, real leak A cracked or missing lock-nut leaves the gauge loose and weeping at exactly the point you want to read pressure.
- Sold on its own This is the nut only, so order the gauge separately if that has failed too.
- Hand tight is enough Plastic threads split if you put a wrench on them, so snug it by hand.
Similar products
Other products people compare with this one.
Product details
The Waterway 519-7441 is the gauge lock-nut used on the Clearwater II cartridge and DE filters. It is the genuine Waterway part.
What it does
The pressure gauge sits in a port on the filter and the lock-nut is what holds it there. Small as it is, it is a sealing part. When it cracks or goes missing, the gauge sits loose, weeps at the port and gives you a reading you cannot trust, which matters because filter pressure is how you know when to clean the element.
Fitting
The nut is plastic, so it is meant to be snugged by hand. Reaching for a wrench is the usual way a new one gets split on the first fit. Order the gauge separately if the gauge itself has failed, since this listing covers the nut alone.
| Brand | Waterway |
|---|---|
| Manufacturer part number | 519-7441 |
| Type | Gauge lock-nut |
| Fits | Waterway Clearwater II cartridge filter, Waterway Clearwater II DE filter |
| Part type | Pool filter part |
| Ships | Parcel |
Request a quote
Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.
Customer reviews
More from Waterway
Questions and answers
What people ask about this product, answered by our pool techs.





















