Part # 4600-3550

Manufacturer Code 273550

Dimensions 3.5" L x 6.25" W x 3.25" D

Alternate Part #'s 14-110-1154, 25357-273-550, 273550, PAC-051-1958, CMP25357273564, PEN273550

Product Description

Replacement Air Relief Assembly manufactured by CMP for select Pentair® Filters. Replaces Pentair® Part Number 273550


All manufacturers’ names, brand names, trademarks, images, symbols, descriptions, and part numbers are used herein for reference purposes only.


?     Asked on 6/8/2015by Rick Pivetz

My PAC FAB Nautilus filter, 20 years old, is dripping from the outlet of the top of the pressure relief valve. I need a replacement. All I see available are 'Manual Relief Valves' p/n 273550. They do not show a top air relief, only a manual thumb screw bleed port. Every day when the timer turns the pump on, air vents out all by itself, the stops when the filter is charged with water. I can't see how that can happen with the manual valve. What is the p/n and where can I buy the auto relief valve?

A  Answered on 6/16/2015 by InyoPools Product Specialist Lennox H.

Rick Pivetz, Automatic Pressure Relief Valves are generally used for commercial application. Someone may have installed it on that filter but that's not something that we sell.

?     Asked on 7/23/2016by Inyo Visitor

I have a pac-fab (aka pentair) fns filter pre 1993. Can I retro fit the newer manual air relief valve to the top? Meaning I would have to drill it to the larger size

A  Answered on 7/27/2016 by InyoPools Product Specialist Lennox H.

Hi, Unfortunately, there is not a way to retrofit this if your Lid does not already have the opening for this air relief assembly. If you can send us photos of your air relief assembly we can locate the correct one for your unit.

?     Asked on 1/18/2018by Brian

Can we buy just the black tee, 273550, without the pressure gauge, etc. And can you confirm that it is black, not clear? Thanks, Brian.

A  Answered on 1/18/2018 by InyoPools Product Specialist Lennox H.

Hi, Brian. The Air Relief body is not sold separately, only as a kit with the gauge. This Air Relief Assembly - 273550 is black. 

?     Asked on 5/26/2019by DeWayne

My air relief valve leaks air and water. I don’t know the year of my filter because it was here when I bought the house. Looking at the attached photos will this work on my filter? Also, are there other parts I should replace like gaskets an or o-rings?


A  Answered on 5/26/2019 by InyoPools Product Specialist Patrick P.

Hi Dwayne, Thank you for the photos they are quite helpful. This 4600-3550 Air Air Relief Assembly is the correct Air Relief Assembly for your Purex Triton FNS Filter shown in the photos.

?     Asked on 6/21/2019by Jimmy White

I want to replace the preasur rellief valve on my nautils De filter, if i order the the assembly does it come with washers ,spacers and nut needed to install it. thanks

A  Answered on 9/19/2019 by InyoPools Product Specialist Hector F.

This air relief assembly comes with everything needed to install it.  


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