BX type ring joint gaskets are designed for BX flange grooves only BX type ring joint gaskets are designed for  BX flange grooves only,it is suitable for higher-pressure ratings starting at 2,000 lbs and ending with 20,000 lbs,incorporate a pressure balance hole to ensure equalization of pressure which may get trapped in the grooves.

Pressure class rating(PSI)
RING NO	2000	3000	5000	10000	15000	20000
BX-150				1 11/16"	1 11/16"
BX-151				1 13/16"	1 13/16"	1 13/16"
BX-152				2 1/16"	2 1/16"	2 1/16"
BX-153				2 9/16"	2 9/16"	2 9/16"
BX-154				3 1/16"	3 1/16"	3 1/16"
BX-155				4 1/16"	4 1/16"	4 1/16"
BX-156				7 1/16"	7 1/16"	7 1/16"
BX-157				9"	9"
BX-158				11"	11"
BX-159				13 5/8"
BX-160			13 5/8"
BX-161			16 3/4"
BX-162			16 3/4"	16 3/4"
BX-163			18 3/4"
BX-164				18 3/4"
BX-165			21 1/4"
BX-166				21 1/4"
BX-167	26 3/4"
BX-168		26 3/4"
BX-169				5 1/8"
BX-171
BX-172
BX-303

Ring Gasket for flange