Armstrong International B1669-5 Pressure Change Assembly
Pressure Change Assembly with 7/64" Orifice for 211, 310, 800, 811, TVS-811, 880, 881, 981, and EM Series Inverted Bucket Traps
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will this kit work on a watson mcdaniel series 1031
Hi, please reply with your unit model number so we can check with factory. Thank you.