Uni-Stop 4" bushing is ideal for concrete penetration points in the slab when using a core bit and can also be used in sump lids. The inside of this bushing has a lip to prevent the PVC pipe from slipping down into the pit. The bushing fits 4" schedule 40 PVC, ABS or the flared side of schedule 20 PVC. Requires 5" hole in slab.
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