Your search query on "MCDONNELL & MILLER Limit & Snap Action Switches" returned the following results:
$246.87 USD @ EBAY Buy It Now
McDonnell & Miller, FS4-3T1-3/4, 3/4" Flow Switch w/NPT body (High Flow Rate) (325753681835)
$399.99 USD @ EBAY Buy It Now
MCDONNELL & MILLER 115000 FS4-3T3-3/4 FLOW SWITCH 3/4" NPT, LOW FLOW RATE, SPDT (195353353500)
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