Replacing pool pump - where do I cut old plumbing?

[wireform]

Good point. I guess I can use it as Plan-B if I screw up with the socket saver tool. I just figured slipping the pipe over would improve the flow dramatically since I wouldn't be constricting the flow to 2" at all. I'm looking into ways to save electricity.

Up sizing will make no difference so let that not make the decision.

 

[LoneStarPool]

Thoughts on using socket saver vs heat gun and pliers to remove old 2" pipe from the valve? I'm just afraid I'll scratch the interior with the socket saver.

 

[Bperry]

Thoughts on using socket saver vs heat gun and pliers to remove old 2" pipe from the valve? I'm just afraid I'll scratch the interior with the socket saver.

The socket saver is the better option. I just used one last week.

 

[Rancho Cost-a-Lotta]

Are you sure your plumbing is 2.5". It all looks like 2".

If you cut the pipe as shown between my line and yours in the photo below, how much pipe remains (inches)?



There should be enough pipe (1.25" or more) to continue with a 2"coupling next to the valve, then a 2" length of pipe into the pump union. I bet one of those unions accepts 2" pipe inside the fitting. If not, use a 2.5 to 2 in. reducer fitting inside the union. It would look very similar to your current plumbing, except the coupling would be butted up next to the valve...

Maybe I'm missing something?

 

[Bperry]

Are you sure your plumbing is 2.5". It all looks like 2".

If you cut the pipe as shown between my line and yours in the photo below, how much pipe remains (inches)?

View attachment 647186

There should be enough pipe (1.25" or more) to continue with a 2"coupling next to the valve, then a 2" length of pipe into the pump union. I bet one of those unions accepts 2" pipe inside the fitting. If not, use a 2.5 to 2 in. reducer fitting inside the union. It would look very similar to your current plumbing, except the coupling would be butted up next to the valve...

Maybe I'm missing something?

I was going to ask the same thing. It doesn’t look like 2.5 inch pipe.

 

[Lake Placid]

Are you sure your plumbing is 2.5". It all looks like 2".

+1. Looks like 2 inch. Inspect the elbows….where the “Lasco” brand label is imprinted, the fitting will also have the nominal pipe size identified. 2-1/2 inch sizing would be odd but not completely out of the question. I can’t zoom in close enough on the pictures to get a good look at the fittings.

 

[Lake Placid]

Your plumbing is 2 inch according to this bushing….

 

[LoneStarPool]

Are you sure your plumbing is 2.5". It all looks like 2".

If you cut the pipe as shown between my line and yours in the photo below, how much pipe remains (inches)?

There should be enough pipe (1.25" or more) to continue with a 2"coupling next to the valve, then a 2" length of pipe into the pump union. I bet one of those unions accepts 2" pipe inside the fitting. If not, use a 2.5 to 2 in. reducer fitting inside the union. It would look very similar to your current plumbing, except the coupling would be butted up next to the valve...

Maybe I'm missing something?

You guys are 100% correct. It's a 2" pipe. There were more fittings than pipe in that inlet section so I got confused and was measuring those instead. Will make getting the pipe much easier.

That little piece after the valve is 1.67" long. when I googled online it said I need 1.75" for a proper connection. Would 1.67" be enough?

 

[Rancho Cost-a-Lotta]

You guys are 100% correct. It's a 2" pipe. There were more fittings than pipe in that inlet section so I got confused and was measuring those instead. Will make getting the pipe much easier.

That little piece after the valve is 1.67" long. when I googled online it said I need 1.75" for a proper connection. Would 1.67" be enough?

Measure the socket on a coupling. I seem to recall its less.

 

[Bperry]

Measure the socket on a coupling. I seem to recall its less.

This ^. Should be closer to 1.25” - 1.375

 

[LoneStarPool]

Measure the socket on a coupling. I seem to recall its less.

I didn't have a coupling on hand, just got back from Home Depot with all the parts. The socket is indeed less (1.375), so I'm good to go. Thanks.

Does anyone know how long I should wait after gluing all together, before turning on the pump?

 

[PoolStored]

30-45 minutes depending on temps...

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• PoolStored
• May 10, 2025

 

[LoneStarPool]

Replaced the pipes, and hooked up power. Ran out of daylight, so wasn't able to turn it on. Will find out tomorrow if it leaks. The gap between the valve and the fitting was just right, I had maybe 1/32" to spare:

 

[Rancho Cost-a-Lotta]

Nice job! Next chapter, remove chlorinator and add SWG

 

[LoneStarPool]

Thanks for the help everyone - especially people who saved me from waiting 2 weeks for 2-1/2" pipe and then finding out I need 2" . I ran the new pump today, and haven't noticed any leaks so far. It's a cheap 1.8 HP variable speed pump, that replaced an old 2.5 HP Hayward pump. I love how quiet it is, even at highest setting. I can literally run it 24/7 and it will be still cheaper than running the old pump for a couple hours a day.

 

[PoolStored]

Clean! Nice job.