O-ring Size

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
e1337
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Location: Florida

Can someone please tell me what the ID and OD of an o-ring that will fit around a 1.25" bushing (its for sealing my pistons access hole). And what type of bolts work best for bolting the bushing to my "t"?

P.S. This is for a barrel-sealing piston gun housed inside of a 1.25" "t" fitting. And the piston is a .75" coupler.

-e1337
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pizlo
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From what I have heard there is no Oring that perfectly fits the inch diameters perfectly. If I am wrong could someone also tell me what oring will fit in a 1.5in T.
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elitesniper
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ive heard you can get large orings and cut off a section and super glue them to back togther
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