Connecting 1 1/4 drain to 1 1/2 pipe


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Old 08-26-07, 04:57 PM
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Connecting 1 1/4 drain to 1 1/2 pipe

Hello All,

Installing a new bathroom sink and the new drain is 1 1/4 inch. The trap and waste piping itself is 1 1/2 inch. I looked at the old stuff that I ripped out with the sink and it just looks like a washer is making up the difference. By what I am reading a "reducer" washer.. Is that all that is needed for this application?

Thanks!
 
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Old 08-26-07, 06:33 PM
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yes. you can use the regular 1 1/2" slip joint nut but with a 1 1/2" x 1 1/4" reducing slip joint washer to connect to the pop up assembly. any hardware store should have one but if you bought a new p-trap it should have came with one too.
 
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Old 08-27-07, 10:21 AM
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Excellent

Thanks!
 
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Old 09-07-07, 07:39 AM
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reducer washer leaks

p-nor, others,

reducer washer is leaking out the top. the slip-joint nut has 1-1/2" hole. only difference from previous installation is instead of 1-1/4 drain assy going directly into trap, i've added 1-1/2" diam extension because assy was too short. i.e. the reduction is made btwn the assy and the extension. the old installation with 1-1/4 assy going into the 1-1/2 trap did not leak. i don't recall if the nut on the trap had a 1-1/2 or 1-1/4 hole. (the workers took it away when they tore out the sink.) Now the 1-1/2 ext into trap is fine, but the transition from the 1-1/4 drain assy to the 1-1/2 straight extension slip-joint leaks. the washer -- typical cheap nylon -- cannot seal around the 1-1/4 plastic. is this because the nut cannot clamp down enough on the washer because its hole is 1-1/2 instead of 1-1/4?

stores i've gone to only have 1-1/2 nut with 1-1/2 hole.

pipes are slightly out of alignment -- because the tightening of the drain hole nuts tweaked the assy -- but not enough to make the washer on the extension leak.
the washer is standard "lasco" grade nylon so should be ok.

will getting a 1-1/2" nut with a 1-1/4" hole do the trick? do they make one?

why do the manufacturers ALWAYS make the drain extension too short?!?

signed,
frustrated weekend plumber
 
 

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