Dust Pipe Home About Dust Pipe Contact Dust Pipe Spiral Pipe and Elbows Flexhose Laterals Reducers Blast Gates Dust Collection Options	» SPIRAL END CAPS These fit inside pipe to cap off the end of a run. They are easily removed for quick access. Size Code Cost 3" EC3 $7.75 4" EC4 $9.00 5" EC5 $10.20 6" EC6 $10.80 7" EC7 $11.30 8" EC8 $12.50 9" EC9 $13.60 10" EC10 $14.60 12" EC12 $18.00 14" EC14 $20.25 16" EC16 $22.00 18" EC18 $30.00 20" EC20 $35.20 22" EC22 $40.60 24" EC24 $45.10