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The WILKINS RK4-375CK1 is a 375A - 2 1/2" - 4" - (300 / 475 4") CK1 Assembly. This assembly is also for the 375A 2 1/2" - 4" sizes. It includes the number one check assembly poppet and the plastic check retainer that holds it in place. It is designed for the 375/475 4" assembly.
The WILKINS RK4-375CK1 is a CK1 assembly designed for use with 375/475 and 375A models.
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