Mfg#	Inside Dia.	Length	Outside Dia.
ZNC C1	3⁄4"	1"	2-1⁄8"
ZNC C2	7⁄8"	1"	2-1⁄8"
ZNC C3	1"	1-1⁄4"	2-1⁄2"
ZNC C4	1-1⁄8"	1-1⁄4"	2-1⁄2"
ZNC C5	1-1⁄4"	1-1⁄4"	2-1⁄2"
ZNC C6	1-3⁄8"	1-1⁄4"	3"
ZNC C7	1-1⁄2"	1-1⁄4"	3"
ZNC C8	1-3⁄4"	1-3⁄8"	3-1⁄2"
ZNC C9	2"	1-3⁄8"	3-1⁄2"
ZNC C9A	2-1⁄4"	1-3⁄8"	3-1⁄2"
ZNC C12	2-1⁄2"	1-1⁄2"	5"
ZNC C12A	2-3⁄4"	1-1⁄2"	5"
ZNC C13	3"	1-1⁄2"	5"
ZNC C14	3-1⁄2"	1-1⁄2"	6-1⁄2"
ZNC C15	4"	1-1⁄2"	6-1⁄2"
ZNC C20	20mm
ZNC C25	25mm
ZNC C30	30mm
ZNC C50	50mm