--- product_id: 57503328 title: "Optimum Pool Technologies® Gas Shutoff Switch Compatible Replacement for Pentair MasterTemp & Max-E-Therm Heaters - Compatible Replacement for 42002-0025S" brand: "optimum pool technologies" price: "₹ 4835" currency: INR in_stock: true reviews_count: 1 category: "Optimum Pool Technologies" url: https://www.desertcart.in/products/57503328-optimum-pool-technologies-gas-shutoff-switch-compatible-replacement-for-pentair store_origin: IN region: India --- # 140°F precision gas shutoff Direct replacement for OEM parts 42002-0025S & 42001-0064S Fits all Pentair MasterTemp & Max-E-Therm models Optimum Pool Technologies® Gas Shutoff Switch Compatible Replacement for Pentair MasterTemp & Max-E-Therm Heaters - Compatible Replacement for 42002-0025S **Brand:** optimum pool technologies **Price:** ₹ 4835 **Availability:** ✅ In Stock ## Summary > 🔥 Stay cool, stay safe—upgrade your pool heater’s brain! ## Quick Answers - **What is this?** Optimum Pool Technologies® Gas Shutoff Switch Compatible Replacement for Pentair MasterTemp & Max-E-Therm Heaters - Compatible Replacement for 42002-0025S by optimum pool technologies - **How much does it cost?** ₹ 4835 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.in](https://www.desertcart.in/products/57503328-optimum-pool-technologies-gas-shutoff-switch-compatible-replacement-for-pentair) ## Best For - optimum pool technologies enthusiasts ## Why This Product - Trusted optimum pool technologies brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **OEM-Grade Replacement:** Engineered to match original parts 42002-0025S & 42001-0064S for flawless performance. - • **Effortless Installation:** Designed for quick swap-out, minimizing downtime and maximizing pool time. - • **Universal Compatibility:** Seamlessly fits all Pentair MasterTemp and Max-E-Therm heater models—no guesswork needed. - • **Precision Safety Control:** Automatically shuts off gas at 140°F for ultimate pool heater safety. - • **Trusted Independent Quality:** Crafted by Optimum Pool Technologies, ensuring reliable aftermarket excellence. ## Overview This Optimum Pool Technologies gas shutoff switch is a precision-engineered, compatible replacement for Pentair MasterTemp and Max-E-Therm pool heaters. It automatically cuts gas flow at 140°F, ensuring safe operation. Designed to fit all relevant models and replace OEM parts 42002-0025S & 42001-0064S, it offers a reliable, easy-to-install aftermarket solution trusted by pool pros. ## Description Product description OPTIMUM Heater Replacement Parts Optimum Pool Technologies manufacturers high quality replacement parts for the most common pool heaters on the market today. When your heater needs a repair, fix it the OPTIMUM way! Gas Shutoff Switch Replacing your broken Gas Shutoff Switch is easy! Two spades located on top of the switch provide easy installation into the heater manifold. Existing color coded wires can be unplugged from old switch and reused when replacing. Compatible Replacement for OEM Part No 42002-0025S MasterTemp Schematic Compatible Replacement for Pentair MasterTemp & Max-E-Therm Pool Heaters The Gas Shutoff Switch is an important switch in your Max-E-Therm or MasterTemp pool heater, and is used to detect when your heat exchanger outlet temperature has exceeded a safe level (140°F) and the switch immediately opens when that happens. You MasterTemp heater will indicate when it is time to replace the High Limit Switch when the “A GS” LED i s displayed. #5 On Schematic Compatible Replacement for MasterTemp & Max-E-Therm : Other Common Replacement Parts Stack Flue Sensor: Part No OPT-42002-0024S A stack flue sensor, located on the exhaust elbow of a pool heater, prevents the flue gas output from exceeding 500°F. When this fails, your system will show error codes E 05 o r E 06 t o indicate that the stack flue sensor must be replaced. This replacement stack flue sensor from Optimum Pool Technologies is a Compatible Replacement for Pentair’s MasterTemp, Max-E-Therm, and other heaters. It is designed specifically as a Compatible Replacement for Sta-Rite heater stack flue sensor. Heater Pressure Switch: Part No 42001-0060S The water pressure switch functions by turning off the burner if the water flow is interrupted. If the water flow is restricted, the water pressure switch may prevent the burner from firing and cause the “Service System” light to go on . If the light remains on after the filter has been serviced, have a qualified service technician check the system. Hi Limit Switch: Part No OPT-0063S The High Limit Switch is an important switch in your Max-E-Therm or MasterTemp pool heater, and is used to detect when your water temperature has exceeded a safe level (135°F) and immediately opens the heat exchanger outlet when that happens. You MasterTemp heater will indicate when it is time to replace the High Limit Switch when the “HLS” LED is displayed. Heater Thermistor: Part No OPT-42001-0053S If the temperature on your control panel’s display is s howing an incorrect temperature, your thermistor may need to be replaced. Thermistors often display a temperature that is much too high when they reach the end of their lifespan. Fix this issue easily by replacing your worn-out thermistor temperature sensor with this Optimum replacement brass thermistor. Review: works great - just what i needed ## Features - Gas Shutoff Switch (140°F) Compatible Replacement for Pentair Sta-Rite MasterTemp & Max E Therm Pool Heaters - Compatible Replacement for Part No. 42002-0025S & 42001-0064S - Compatible Replacement for: Pentair MasterTemp (All Models) & Max-E-Therm (Models SR200, SR333, SR400) Heaters - Manufactured by Optimum Pool Technologies - NOTE: This is a compatible aftermarket replacement part. The manufacturers' names and part numbers have been used for reference purposes only. Optimum Pool Technologies Inc is an independent brand. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01HJ19B0C | | Best Sellers Rank | #1,048,257 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,536 in Swimming Pool Heater Parts | | Brand Name | Optimum Pool Technologies | | Customer Reviews | 4.7 out of 5 stars 10 Reviews | | Item Weight | 3 Ounces | | Manufacturer | Optimum Pool Technologies | | Part Number | OPT-0025S | ## Images ![Optimum Pool Technologies® Gas Shutoff Switch Compatible Replacement for Pentair MasterTemp & Max-E-Therm Heaters - Compatible Replacement for 42002-0025S - Image 1](https://m.media-amazon.com/images/I/31qGgXL5naL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ works great *by W***M on April 1, 2019* just what i needed --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.in/products/57503328-optimum-pool-technologies-gas-shutoff-switch-compatible-replacement-for-pentair](https://www.desertcart.in/products/57503328-optimum-pool-technologies-gas-shutoff-switch-compatible-replacement-for-pentair) --- *Product available on Desertcart India* *Store origin: IN* *Last updated: 2026-05-22*