Backyard Plus was great to work with. We easily found the necessary component on your web site (appreciated your verbiage that this was the only part that had ball bearings). We ordered two over the weekend and on Monday received notice that they had shipped. Provided videos are helpful if needed and the price was competitive. Thank you for a great transaction…will use again if necessary!On 01/15/2026 by J. O. (verified customer)
O-Ring, Control Thermistor
Sku: 34878
$1.87
Control Thermostat Thermistor o-ring for the 79006 and 78970 thermistors. This o-ring is located on the “inlet” side of the heater and is the larger of the two thermistor o-rings. For the outlet side of the heater see the part# 34879 o-ring.
This part can be found on
many Hot Spring, Limelight, Hot Spring pre 89, Tiger River models from 1994 to 2025
| Ref. | Diagram | |
|---|---|---|
| # 3 | Thermistors (PUG, ORCA, and EAGLE Compatible) (Hot Spring 2007 - 2018) | Shop by Diagram |
| # 7 | PDR Heater (Hot Spring 2007 - 2007) | Shop by Diagram |
| # 7 | No Fault Heater (Hot Spring 2007 - 2018) | Shop by Diagram |
| # 9 | No Fault 5500 Cartridge Heater 1995-1996 (Hot Spring 1995 - 1996) | Shop by Diagram |
| # 10 | Heater (95-96) 70914 & 70915 (Hot Spring 1995 - 1996) | Shop by Diagram |
| # 7 | No Fault Heater 1997-2002 (Hot Spring 1997 - 2002) | Shop by Diagram |
| brand | model | years |
|---|---|---|
| Hot Spring | Aria (AR) | 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Aria NXT (ARN) | 2022, 2023 |
| Limelight | Beam I (BMI) | 2022, 2023, 2024 |
| Limelight | Beam II (BMII) | 2022, 2023, 2024 |
| Limelight | Flair (FLR) | 2022, 2023, 2024 |
| Limelight | Flash (FSH) | 2022, 2023, 2024 |
| Hot Spring | Grandee (G) | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| Hot Spring | Grandee (GG) | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Grandee NXT (GGN) | 2022, 2023, 2024, 2025 |
| Hot Spring | Prodigy (H) | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Prodigy (HN) | 2022, 2023, 2024, 2025 |
| Hot Spring | Sovereign (I) | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Hot Spring | Sovereign (II) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Sovereign (IIN) | 2022, 2023 |
| Hot Spring | Jetsetter (J) | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Hot Spring | Jetsetter (JJ) | 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Jetsetter (JJN) | 2022, 2023, 2024, 2025 |
| Hot Spring | Jetsetter LX (JTN) | 2022, 2023, 2024 |
| Hot Spring | Envoy (KK) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Envoy NXT (KKN) | 2022, 2023, 2024 |
| Limelight | Pulse (PLS) | 2022, 2023, 2024, 2025 |
| Limelight | Prism (PSM) | 2022, 2023, 2024, 2025 |
| Hot Spring | Vista (SS) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 |
| Hot Spring | Triumph (TRHN) | 2022 |
| Hot Spring | Vanguard (V) | 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| Hot Spring | Vanguard (VV) | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Vanguard NXT (VVN) | 2022, 2023, 2024 |
| Hot Spring | Classic (F) | 1995, 1996, 1997, 1998, 1999, 2000 |
| Hot Spring | Classic 230v. (FH) | 1995, 1996 |
| Hot Spring | Sovereign 230v. (IH) | 1995, 1996 |
| Hot Spring | Highlife Limited Edition (ILE) | 2003 |
| Hot Spring | Highlife (K) | 1995, 1996 |
| Hot Spring | Summit (R) | 1995, 1996 |
| Hot Spring | Landmark (S) | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
| Tiger River | Caspian (CHP) | 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Caspian (CPN) | 2003 |
| Tiger River | Siberian (L) | 2002, 2003, 2004 |
| Tiger River | Khyber (LH) | |
| Tiger River | Bengal (M) | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Manora 230v. (MH) | 1996 |
| Tiger River | Bengal (MM) | 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Sumatran (N) | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Tondi Round (P) | 1995, 1996 |
| Tiger River | Tondi Round 230v. (PH) | 1996 |
| Limelight | Bolt (BLT) | 2012, 2013, 2014, 2015, 2016, 2017 |
| Limelight | Gleam (GLM) | 2013, 2014, 2015, 2016, 2017 |
| Limelight | Glow (GLW) | 2013, 2014, 2015, 2016, 2017 |
| Limelight | Beam I (BMI) | 2019 |
| Limelight | Beam II (BMII) | 2019 |
| Limelight | Flair (FLR) | 2019 |
| Limelight | Flash (FSH) | 2019 |
| Limelight | Pulse (PLS) | 2019 |
| Limelight | Prism (PSM) | 2019 |
| Hot Spring | Grandee (G) | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| Hot Spring | Grandee (GG) | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Sovereign (II) | 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Jetsetter (JJ) | 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Envoy (KK) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Vanguard (V) | 2007 |
| Hot Spring | Vanguard (VV) | 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Classic (F) | 1997, 1998, 1999, 2000 |
| Hot Spring | Prodigy (H) | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Highlife Limited Edition (ILE) | 2003 |
| Hot Spring | Jetsetter (J) | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Hot Spring | Highlife (K) | 1995, 1996 |
| Hot Spring | Landmark (S) | 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
| Tiger River | Caspian (CPN) | 2003 |
| Tiger River | Siberian (L) | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
| Tiger River | Bengal (M) | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Bengal (MM) | 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Sumatran (N) | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Limelight | Bolt (BLT) | 2012, 2013, 2014, 2015, 2016, 2017 |
| Limelight | Beam I (BMI) | 2022, 2023, 2024 |
| Limelight | Beam II (BMII) | 2022, 2023, 2024 |
| Limelight | Flair (FLR) | 2022, 2023, 2024 |
| Limelight | Flash (FSH) | 2022, 2023, 2024 |
| Limelight | Gleam (GLM) | 2013, 2014, 2015, 2016, 2017 |
| Limelight | Glow (GLW) | 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 |
| Limelight | Pulse (PLS) | 2022, 2023, 2024, 2025 |
| Limelight | Prism (PSM) | 2022, 2023, 2024 |
| Hot Spring | Aria (AR) | 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Grandee (G) | 2003, 2004, 2005, 2006, 2007 |
| Hot Spring | Grandee (GG) | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Prodigy (H) | 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Highlife (Costco) (HILF) | 2006 |
| Hot Spring | Sovereign (I) | 2003, 2004, 2005, 2006, 2007, 2008 |
| Hot Spring | Sovereign (II) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Highlife Limited Edition (ILE) | 2003 |
| Hot Spring | Jetsetter (J) | 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| Hot Spring | Jetsetter (JJ) | 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Envoy (KK) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Hot Spring | Landmark (S) | 2003 |
| Hot Spring | Vista (SS) | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 |
| Hot Spring | Vanguard (V) | 2003, 2004, 2005, 2006, 2007 |
| Hot Spring | Vanguard (VV) | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Tiger River | Caspian (CHP) | 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Bengal (M) | 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Bengal (MM) | 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Sumatran (N) | 2005, 2006, 2007, 2008, 2009, 2010 |
| Limelight | Bolt (BLT) | 2012, 2013, 2014, 2015, 2016, 2017 |
| Limelight | Beam I (BMI) | 2018 |
| Limelight | Beam II (BMII) | 2018 |
| Limelight | Flair (FLR) | 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Limelight | Flash (FSH) | 2018 |
| Limelight | Gleam (GLM) | 2013, 2014, 2015, 2016, 2017 |
| Limelight | Glow (GLW) | 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 |
| Limelight | Pulse (PLS) | 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| Limelight | Prism (PSM) | 2018 |
| Hot Spring | Classic (F) | 1995, 1996 |
| Hot Spring | Classic 230v. (FH) | 1995, 1996 |
| Hot Spring | Grandee (G) | 1995, 1996 |
| Hot Spring | Grandee (GQ) | 1996 |
| Hot Spring | Prodigy (H) | 1995, 1996 |
| Hot Spring | Sovereign (I) | 1995, 1996 |
| Hot Spring | Sovereign 230v. (IH) | 1995, 1996 |
| Hot Spring | Sovereign 230v. (IHQ) | 1996 |
| Hot Spring | Sovereign (IQ) | 1996 |
| Hot Spring | Jetsetter (J) | 1995, 1996 |
| Hot Spring | Jetsetter (JQ) | 1996 |
| Hot Spring | Highlife (K) | 1995, 1996 |
| Hot Spring | Summit (R) | 1995, 1996 |
| Hot Spring | Landmark (S) | 1995, 1996 |
| Tiger River | Khyber (L) | 1995, 1996 |
| Tiger River | Manora (M) | 1995, 1996 |
| Tiger River | Manora 230v. (MH) | 1995, 1996 |
| Tiger River | Tondi Round (P) | 1995, 1996 |
| Tiger River | Tondi Round 230v. (PH) | 1995, 1996 |
| Hot Spring | Classic (F) | 1995, 1996 |
| Hot Spring | Classic 230v. (FH) | 1995, 1996 |
| Hot Spring | Grandee (G) | 1995, 1996 |
| Hot Spring | Prodigy (H) | 1995, 1996 |
| Hot Spring | Sovereign (I) | 1995, 1996 |
| Hot Spring | Jetsetter (J) | 1995, 1996 |
| Hot Spring | Highlife (K) | 1995, 1996 |
| Hot Spring | Landmark (S) | 1995, 1996 |
| Tiger River | Khyber (L) | 1995, 1996 |
| Tiger River | Manora (M) | 1995, 1996 |
| Tiger River | Manora 230v. (MH) | 1996 |
| Tiger River | Tondi Round (P) | 1995, 1996 |
| Tiger River | Tondi Round 230v. (PH) | 1996 |
| Hot Spring | Grandee (G) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Grandee (GQ) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Prodigy (H) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Prodigy (HQ) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Sovereign (I) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Sovereign Limited Edition (ILE) | 2002 |
| Hot Spring | Sovereign (IQ) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Jetsetter (J) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Jetsetter (JQ) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Landmark (S) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Hot Spring | Landmark (SQ) | 1997, 1998, 1999, 2000, 2001, 2002 |
| Tiger River | Caspian (CHP) | 2004, 2005 |
| Tiger River | Caspian (CPN) | 2003 |
| Tiger River | Siberian (L) | 2002, 2003, 2004 |
| Tiger River | Bengal (M) | 2002, 2003, 2004, 2005 |
| Tiger River | Bengal (MM) | 2005 |
| Tiger River | Sumatran (N) | 2002, 2003, 2004, 2005 |
| Tiger River | Caspian (CHP) | 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Tiger River | Bengal (MM) | 2005, 2006, 2007, 2008, 2009, 2010 |
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