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4-1/2”, Style 4501 Pressure Rings, SSF, Gray Black color, -110 to +500°F, 5,500 psi，Standard Service
4”, Style 4501 Pressure Rings, SSF, Gray Black color, -110 to +500°F, 5,500 psi，Standard Service
3-3/4" PUSH BLOCK, JUNK RING，6-3/4" - 4 TPI THREAD RING/INSERT
4" PUSH BLOCK, JUNK RING，6-3/4" - 4 TPI THREAD RING/INSERT
4-1/2" PUSH BLOCK, JUNK RING，6-3/4" - 4 TPI THREAD RING/INSERT
4" PUSH BLOCK, JUNK RING，7-3/4" - 3 TPI THREAD RING/INSERT
4-1/2" PUSH BLOCK, JUNK RING，7-3/4" - 3 TPI THREAD RING/INSERT
Pair with the Packing Nut Bar or ratchet for easier installation and removal of the retainer nut