HALTEC Z3-80 (PC0579) Z-Bore 80º Degree Swivel Angle Connector 215x65R16 It is a multi-fit tube

It is a multi-fit tube that is made to be used in the following sizes: 18x8

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Haltec A-100-VC-2 Metal Screwdriver Top Valve Caps with Inner Seals for Standard Bore Valves (100 Pack)

15 inch center bore

HALTEC Z3-80 (PC0579) Z-Bore 80º Degree Swivel Angle Connector 215x65R16 It is a multi-fit tubeThe second component of the Z Bore Valve System is the swivel angle connector which threads onto the spud. As with Super Large Bore valves, you can install a core housing into the spuds to make a valve. Connectors of various angles and lengths are available. The connector accommodates a flexible extension which attaches to the Z 10 core housing.