Pentair 355389 left hand thread impeller locking screwPentair Impeller Locking Screw, 355389 In stock$999
Pentair 355389 left hand thread impeller locking screw

Pentair Impeller Locking Screw, 355389

Ask a questionMPN 355389
$999
In stock

30 day returns · Easy, with prepaid labels provided

Quick overview

  • Left hand thread It backs out clockwise, the opposite of an ordinary fastener, which is what catches people out.
  • Genuine Pentair Factory part 355389.
  • Holds the impeller on the shaft The screw locks the impeller to the motor shaft so it cannot work loose in service.
  • Challenger and SuperFlo Listed for Pentair Challenger and Pentair SuperFlo pumps.
  • Cheap part, expensive failure A stripped or missing locking screw lets the impeller move and takes the pump performance with it.
  • Worth renewing on a rebuild Small enough to replace as a matter of course any time the impeller comes off.
Full description and specifications ↓

Need a hand?

Bilingual support from pool professionals.

Send us a message

A pool professional will get back to you, usually the same business day.

About Pentair Impeller Locking Screw, 355389, SKU PAC-101-3141. We will include it with your message.

We use your details to answer this message and nothing else.

Frequently bought together

Current item Pentair Impeller Locking Screw, 355389
Pentair

Impeller Locking Screw, 355389

$999
Pentair Lid O-Ring, 5-3/4" ID, 350013Z
Pentair

Lid O-Ring, 5-3/4" ID, 350013Z

$599
Pentair Genuine OEM O-Ring, Square 8.5 in. Closure, 152509
Pentair

Genuine OEM O-Ring, Square 8.5 in. Closure, 152509

$1299
Pentair Challenger Front Housing, Slip Suction, Black, 355468Z
Pentair

Challenger Front Housing, Slip Suction, Black, 355468Z

$13999
Pentair Challenger Pump Strainer Pot, 355300
Pentair

Challenger Pump Strainer Pot, 355300

$13999
Pentair Challenger Front Housing O-Ring, 355329Z
Pentair

Challenger Front Housing O-Ring, 355329Z

$2299
Pentair Genuine OEM High Flow Diffuser O-Ring, 355030
Pentair

Genuine OEM High Flow Diffuser O-Ring, 355030

$1799
Subtotal

Product details

The Pentair 355389 is the impeller locking screw for Pentair Challenger and SuperFlo pool pumps. It is left hand threaded, and it is the genuine Pentair part.

Left hand thread

The screw is deliberately reverse threaded, so the impeller cannot unscrew itself as the motor spins. That also means it loosens clockwise. More than one of these has been rounded off by someone leaning hard on it the wrong way, so get the direction right before you put weight on the tool.

What it does

The screw locks the impeller onto the motor shaft. If it strips, backs out or is left out after a rebuild, the impeller can shift on the shaft, and the pump loses flow and starts making noise long before anyone thinks to look at a single small screw.

When to replace it

Any time the impeller comes off, for a mechanical seal or for a rebuild, look at the screw before it goes back in. A screw with a damaged head or worn threads is not worth reusing.

Specifications
Brand Pentair
Manufacturer part number 355389
UPC 788379699291
Type Impeller locking screw
Thread Left hand
Part type Pool pump part
Fits Pentair Challenger, Pentair SuperFlo
Shipping weight 0.02 lb
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.

Request a quote

Customer reviews

More from Pentair

Questions and answers

What people ask about this product, answered by our pool techs.

Which way does it undo?
It is left hand threaded, so it loosens clockwise and tightens counterclockwise. Turning it the normal way only makes it tighter.
Which pumps use this screw?
Pentair lists it for the Challenger and the SuperFlo pool pumps.
Is it a genuine Pentair part?
Yes. It is Pentair OEM part 355389.
Do I need one if I am only changing the seal?
The impeller has to come off to reach the mechanical seal, so the locking screw comes out either way. It is worth having a fresh one on hand in case the old one is chewed up.
Ask your own question