The McDonnell & Miller 51-S-HD (Part Number 135800) is a heavy-duty head mechanism only replacement designed specifically for Series 51-S mechanical water feeders

commonly found in older Bryant and Payne units

with an adjustable range of 3-5 in

Common Questions Can I install this regulator in any orientation

this is a dedicated liquid line uni-flo drier

Trane 2AYTXVH3H6060A TXV Kit 320735-701 The McDonnell & Miller 51-S-HDThe Trane 2AYTXVH3H6060A is a field mounted R22 TXV KIT designed for high capacity applications requiring precise superheat control. For technicians servicing legacy 5 ton systems, this thermal expansion valve is a critical component for maintaining evaporator efficiency and protecting the compressor from liquid slugging. Supporting a nominal capacity of up to 60,000 BTU, the 2AYTXVH3H6060A ensures the refrigerant flow rate is dynamically adjusted