Part # 3295-257

Manufacturer Code 9980220

Dimensions 1-1/8" X 1/4"

Alternate Part #'s 9980220, MAY9980220

Product Description

Your Source for Swimming Pool & Spa Parts -


?     Asked on 10/15/2018 by Bob

How many of Diag.basic - Non Return Diafragms (9980220) are used in the Dolphin Nautilus robotic cleaner? It looks like up to four could be used, but I only see one on my unit. Thanks Bob

A     Answered on 10/16/2018 by InyoPools Product Specialist Lennox H.

Hi, Bob. The units that use this Non-Return Diaphragm - 9980220 requires a total of 4. 

?     Asked on 7/9/2018 by KATHRIN GRAY

is this part critical? what is it's purpose? my dx3 seems to be "lost" in the pool and keeps recleaning only one section of the pool. it seems to favor one side that is always the top when cleaning the sides, and one that is the bottom and then flips a lot to one side so I thought I would replace the pulleys (SINGLE DRIVE PULLEY (3883645) ). cleaner doesn't climb up stairs like it once did. thanks for your help. I need to get this fixed!

A     Answered on 7/14/2018 by InyoPools Product Specialist Lennox H.

Hi, Kathrin. This is a critical part. The purpose is to ensure proper suction and water flow through the cleaner. The problems you having is hard to diagnose without inspecting the cleaner. It would be best if you can take the unit to an authorized repair center for a full inspection. 


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