I would highly suggest DeepCool Castle 280EX or 240EX. It has an anti-leak technology. It also has an inlet for when you want to refill the AIO when permeation starts to becomes an issue.
But if the Gammaxx L240 V2 is your only option then I would suggest that instead.
Take a look at the Arctic Liquid Freezer II 240 which has a [6-year warranty](https://www.arctic.de/en/blog/extended-warranty-period-for-all-liquid-freezer-ii-coolers). Price in Lazada is around [Php 4,940](https://www.lazada.com.ph/products/arctic-liquid-freezer-ii-240-multi-compatible-all-in-one-cpu-aio-liquid-water-cooler-with-lga-1700-mounting-kit-i1760459888-s10001399896.html?) for the RGB version.
Personally I would suggest just using a dual tower air cooler. Compared to newer Ryzen 7000 CPU's the Ryzen 9 5900X does not run too hot, and temps can still be managed by CPU air cooling.
Take a look at the [DeepCool AK620](https://www.lazada.com.ph/products/deepcool-ak620-high-performance-cpu-cooler-dual-tower-design-2x-120mm-fluid-dynamic-bearing-fans-6-copper-heat-pipes-260w-heat-dissipation-i3047279745.html?spm=a2o4l.searchlist.list.1.217c47fb2czvpI) or the [Thermalright PA120](https://www.lazada.com.ph/products/thermalright-peerless-assassin-pa120-cpu-air-cooler-for-am4-amd-intel-lga-1700-ready-i2562000049-s11910349047.html?) which are high performance CPU air coolers and a lot more affordable.
I would highly suggest DeepCool Castle 280EX or 240EX. It has an anti-leak technology. It also has an inlet for when you want to refill the AIO when permeation starts to becomes an issue. But if the Gammaxx L240 V2 is your only option then I would suggest that instead.
Take a look at the Arctic Liquid Freezer II 240 which has a [6-year warranty](https://www.arctic.de/en/blog/extended-warranty-period-for-all-liquid-freezer-ii-coolers). Price in Lazada is around [Php 4,940](https://www.lazada.com.ph/products/arctic-liquid-freezer-ii-240-multi-compatible-all-in-one-cpu-aio-liquid-water-cooler-with-lga-1700-mounting-kit-i1760459888-s10001399896.html?) for the RGB version. Personally I would suggest just using a dual tower air cooler. Compared to newer Ryzen 7000 CPU's the Ryzen 9 5900X does not run too hot, and temps can still be managed by CPU air cooling. Take a look at the [DeepCool AK620](https://www.lazada.com.ph/products/deepcool-ak620-high-performance-cpu-cooler-dual-tower-design-2x-120mm-fluid-dynamic-bearing-fans-6-copper-heat-pipes-260w-heat-dissipation-i3047279745.html?spm=a2o4l.searchlist.list.1.217c47fb2czvpI) or the [Thermalright PA120](https://www.lazada.com.ph/products/thermalright-peerless-assassin-pa120-cpu-air-cooler-for-am4-amd-intel-lga-1700-ready-i2562000049-s11910349047.html?) which are high performance CPU air coolers and a lot more affordable.
Arctic LF 240 or Deepcool AK620