1-1/2" x 1-1/2" Square plastic tube cap fits inside 1-1/2" Square pipe
1" x 1-1/2" Rectangle plastic tube cap fits inside 1" x 1-1/2" Rectangle pipe
1" x 1" Square plastic tube cap fits inside 1" Square pipe
1" x 2" Rectangle plastic tube cap fits inside 1" x 2" Rectangle pipe
1" x 3" Rectangle plastic tube cap fits inside 1" x 3" Rectangle pipe
2" x 2" Round plastic tube cap fits inside 2" round pipe
2" x 2" Square plastic tube cap fits inside 2" Square pipe
2" x 3" Rectangle plastic tube cap fits inside 2" x 3" Rectangle pipe
2" x 4" Rectangle plastic tube cap fits inside 2" x 4" Rectangle pipe
3" x 3" Square plastic tube cap fits inside 3" Square pipe
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