Your search for "LOWER VALVE ASSEMBLY" revealed the following:
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D60519 | LOWER VALVE ASSEMBLY | Armstrong International
Armstrong International sku: D60519
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D60521 | LOWER VALVE ASSY | Armstrong International
Armstrong International sku: D60521
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243-43757-03 | Gas Valve Assembly | Bradford White
Bradford White sku: 243-43757-03
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800-0151 | EXPANSION VALVE ASSEMBLY | Bard HVAC
Bard HVAC sku: 800-0151
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SP20631 | Conversion Kit Assembly - E175 | Rheem-Ruud
Rheem-Ruud sku: SP20631
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AM41877 | Burner Assembly | Rheem-Ruud
Rheem-Ruud sku: AM41877
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SP20465 | Conversion Kit Assembly - E10 | Rheem-Ruud
Rheem-Ruud sku: SP20465
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60J92 | 65314900 VALVE-GAS | Lennox
Lennox sku: 60J92
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6025677 | FOUR WAY VALVE ASSY | Daikin-McQuay
Daikin-McQuay sku: 6025677
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510-0144-00 | VALVE-THERM EXPANS ASSM | Copeland
Copeland sku: 510-0144-00
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2050467 | BODY/ FOUR-WAY VALVE ASSY. | Daikin-McQuay
Daikin-McQuay sku: 2050467
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V6EPB-B-S-2-B | Mini-size flow switch | brass upper and lower body | 3/4" NPT | brass tee. | Dwyer Instruments
Dwyer Instruments sku: V6EPB-B-S-2-B
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BAYLPKT210B | Natural Gas To LP Propane Conversion Kit W/O SS BURNERS | TRANE PARTS
TRANE PARTS sku: BAYLPKT210B
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VAL9781 | TXV ASSY | Trane
Trane sku: VAL9781
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VEB-4602CBCL | CCV | 0.5" - 3 Way | 0.6 Cv | Electronic Fail-Safe | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4602CBCL
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VEB-4602JBCK | CCV | 0.5" - 3 Way | 4.3 Cv | Non-Spring Return | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4602JBCK
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VEB-4608NBCL | CCV | 2" - 3 Way | 108.5 Cv | Electronic Fail-Safe | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4608NBCL
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VEB-4603MBCL | CCV | 0.75" - 3 Way | 11 Cv | Electronic Fail-Safe | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4603MBCL
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VEB-4602JBCL | CCV | 0.5" - 3 Way | 4.3 Cv | Electronic Fail-Safe | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4602JBCL
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VEB-4606HBCL | CCV | 1.5" - 3 Way | 61.1 Cv | Electronic Fail-Safe | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4606HBCL
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VEB-4602LBCK | CCV | 0.5" - 3 Way | 8 Cv | Non-Spring Return | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4602LBCK
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3H0369740002 | LP TO NATURAL CONVERSION KIT | Modine
Modine sku: 3H0369740002
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VEB-4610EBCK | CCV | 2.5" - 3 Way | 74.1 Cv | Non-Spring Return | 24V | Modulating | KMC Controls
KMC Controls sku: VEB-4610EBCK