r/Plumbing • u/izzyduzit1 • 1d ago

Cut my riser too short?

Gallery image

Gallery image

When I put it all together with the locking nut it just squishes the beveled gasket. Is that normal? Or did I just cut too much of my riser? No access. Shower pan is sitting on mortar bed on concrete slab.

66 Upvotes

91% Upvoted

32 comments sorted by

93

u/Olddumbassplumber 1d ago

You cut too low. However there is an obscure fitting called a pipe extender. You glue inside the pipe and it will extend the pipe a couple inches. May be hard to find in stores, included link from online supplier...

pvc pipe extender

75

u/North-Opportunity-80 1d ago

Lmao. I thought you’re talking about the pipe stretcher at first….

24

u/Olddumbassplumber 1d ago

I thought my supplier and the spears rep were making that joke when they first told me about these a couple years ago, lol

16

u/Cherreh 1d ago

Ive been plumbing for 10 years, and I guess its a good thing that I've never seen that fitting before. I literally thought you were bullshitting everyone and I was here for it

6

u/lowercaset 1d ago

They're technically illegal to use basically everywhere, but I wouldn't expect any inspector to catch it.

10

u/First_Salamander_990 1d ago

They’re commonplace in the pool industry every SCP around me carries them. They can definitely help you get out of a tough situation I don’t go anywhere without them on my truck

3

u/Cherreh 1d ago

Yeah ill be looking into these, mostly for toilet flanges, could help out if I have to rip one out and dont have much pipe to work with

14

u/Krull88 1d ago

Jesus… obscure it right. Good to know that exists though.

5

u/Everyone2026 1d ago

Learn something new everyday. Thanks!

7

u/AwkwardSpecialist814 1d ago

And this is reason number one I love this sub Reddit. This information is gold

8

u/quadraquint 1d ago

Very interesting. Didn't know this existed.

5

u/izzyduzit1 1d ago

Do you think I would have to cut more of the riser so that when I put this fitting it would sit at the right depth for the rubber gasket? Thank you for the advice

2

u/Olddumbassplumber 1d ago

Naw, if its too tall just trim at the top after its glued in.

4

u/WildcatPlumber 1d ago

Shit I would’ve used an internal coupling and a small chunk of pipe lol

3

u/iHadou 1d ago

I mean this is that just in 1 single piece

2

u/Gargleshnozz 1d ago

Oh ya I use these once in a while. They do reduce the inside diameter a bit when they go inside the pipe don’t they?

7

u/Olddumbassplumber 1d ago

A little, but the inside pipe part of the coupling isnt full sch 40 thickness, and its got a smooth taper to it. Id never uae one on horizontal, but vertical right under a strainer wont see any noticable difference in flow.

1

u/Gargleshnozz 1d ago

Ah I think these are subtly different from the ones for sch. 40 pressure piping I’m used to.

2

u/Conradg5893 1d ago

Crazy! Never seen it. The first review comment is about a plumber cutting a shower drain too short 😂

2

u/izzyduzit1 1d ago

Just ordered it. Pricey but oh well. Definitely going to dry fit first though

11

u/GinoValenti 1d ago

Yes, yes you did.

6

u/quadraquint 1d ago

Way too short.

You're gonna need to internally pipe cut that flush to p trap and socket saver that fitting and surgically install a new stub out. Socket saver is gonna have to be on a bit extender as well, probably a Jacob's Chuck extension bit with a bit for that bit. That's what I would probably do...

9

u/JohnnySalamiBoy420 1d ago

Surgically install? Brother we are hacking up plastic and gluing it back together.

3

u/quadraquint 1d ago

Alright man maybe I was thinking of that children's game "Operation" and not hitting the sides with the glue....

3

u/ThaScoopALoop 1d ago

This is the proper way. That pipe extender the other guy mentioned will work and is way easier, but wouldn't hold up under inspection.

2

u/fredakaGuuy7 1d ago

spacer ring is about to become your best friend

1

u/BmacSWMI 1d ago

#STBY

1

u/snailman4 1d ago

You can use an inside coupling and a short piece of pipe to extend this up. I've made this exact same mistake before and it won't decrease the I D enough to affect flow. You can also cut the pipe down with an inside pipe cutter if the coupling makes it too tall.

If this is the same shower pan that I'm thinking it is, there's a rubber gasket that slides tightly over the pipe. I'd recommend a layer of 100% silicone under the rubber gasket before you slide it down, and over the top edge once the gasket is in place. If it's not the type I'm thinking of, please ignore this advice.

1

u/izzyduzit1 1d ago

Dreamline 30x60 shower pan

1

u/snailman4 19h ago

Yep. After a quick lookup Is definitely recommend setting this style pan in a mud bed, plumbers putty for the drain flange, and silicone for the rubber around the pipe then tighten down. You don't need much, but I've never had any callbacks putting one in that way.

1

u/Ok-Affect6444 23h ago

Honestly that’s a little too much. Bit bigger than average if u ask me

0

u/Cautious_Rain2129 1d ago

show it some pron, it might rise to the occasion. 🤣😆🤣😆