Does one piece of this just push into the other+ get solvent welded?

[WaterTight]

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[turnpin]

Yes but no.....no solvent weld required...regards Turnpin

 

[PlumbBobBob]

looks like it does, one looks slightly wider

 

[Ermintrude]

Just push together . Don't think its abs st solvent would make a mess. A dab of clear silicone will help end in to socket and make it100. % tight .

 

[Ray Stafford]

+1 for not solventing.

 

[tamz]

One just pushes inside the other. No sealing required as the water runs straight past the joint with no restrictions or build up of pressure (much the same as a downpipe joint isn't sealed).
Lap it in at least 3"