In replumbing my little compressor set up, I found a couple of cheaper alternatives that may be of interest.
Instead of using these:
HWH RAP6354 Air Solenoid Valve - Northwest RV Supply (https://www.nwrvsupply.com/product/rap6354-air-solenoid-valve/#:~:text=HWH%20RAP6354%20Air%20Solenoid%20Valve.%20$)
Amazon.com: Air-Compressor Pressure Switch (https://www.amazon.com/Square-Schneider-Electric-9013FHG2J27-Air-Compressor/dp/B000CCJ6QK/ref=sr_1_2?crid=1UE4CVH1X8O3P&dib=eyJ2IjoiMSJ9.K6yWks6HBFK3UQ_66W8bmJ2sjG0FvPH7VYDumFsnYx_ijzEXWFu9gMhBVWtGRpVyAks_1nQFabtVTyjbfJyKcC3yNdUsEVTfmA_GntayTsG-C3w_pEEuLVvEB34f6vUL_1sivgzE5pGnx5UnKX4mpC75x3K9q19AjXGooAy7JUrFSJGkB5atOrfEjW_ZJMIUr_6uzo4BTyk6XNFtkl25DQDqXKAm63pkgtnt8xg64oCrC5hRJxU3B5bqpvZvce3edMbo__6OHqjsJSl4FOa7IRL9Mra2myXTk2Bn5WBgpLY.iNyQteDJD0U9LGSfFYy3tx82A5tf11GTJqZ9GwLWl2Y&dib_tag=se&keywords=9013fhg2j27&qid=1726190979&sprefix=9013fhg2j27%2Caps%2C126&sr=8-2)
I went with these:
Amazon.com: SNS DC12V 1/4" NPT Brass Electric Solenoid Valve Normally Open... (https://www.amazon.com/SNS-2WK025-N08-Electric-Solenoid-Normally/dp/B07SPK59LP/ref=sr_1_2_sspa?crid=YKRZZ85ULOAK&dib=eyJ2IjoiMSJ9.diHckW4k4okm-8fdWh6oGD62QVsx1VzeQOILYlpYA-baEZFpD3u0UPvAUe7OuqYiNWg4_GLFzvtKoQtPGgLZhcKmZTcNfVkABjIx-UdkNv-oOkZ4m5tgSKGWjkh_RdsQ0FHiFvRVZWg2fg3DmoBb4dPVxrPO2_pQH48btnhs8BBY8gRQFeV-VCqKKW97bQWJrPW-OQs1OIUJAOTOekhGgyY7_nCRXibx_zohWVD-MPA.sIxDSDV6498swX2jS_8tejDuYC65L_H8gzxZTq0lcFI&dib_tag=se&keywords=sns%2Bdc12v&qid=1726191102&sprefix=sns%2Bdc12v%2Caps%2C131&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1)
Amazon.com: Air Pressure Switch 70-100 PSI Pressure Switch (https://www.amazon.com/FanWayer-Pressure-70-100PSI-Compressor-Controller/dp/B07XYHSDZ1/ref=sr_1_3?crid=1V2WJFMDX1A9T&dib=eyJ2IjoiMSJ9.41VvV1v6Ypg0f1ywwFJhFDNEm2AETgJHZK17E4ke0B0QJof1qYWXCPsdvPX3O4iYXQfd3eqV_sFFSFU6yXHSjMzlYgKJhpYdSnyv_5enj02r7y0FRdVwHI5pe3y2TJrBL0DZvtTQJmWv20fkH9T6vboh42ThrWn7facv7RYLQz1wzqtToj4G6q7okeDOHdd-yzxGKbttZRYwEAJhi0h_jUk93e5d_CYm2uVz3EFGnFmsNc8SD05_AxqLaEFh98cRH_82IerAao1mG8p6XkmbPT4vdVmJQXqBnBe1cX8gKTM.ntDRSuRd1WdeTPcrInpNgcDwub79gO3OpoNwwjxUNGA&dib_tag=se&keywords=12+volt+80-100pressure+switch&qid=1726191033&sprefix=12+volt+80-100pressure+switch%2Caps%2C115&sr=8-3)
If your solenoid drain valve is too corroded or rusted to rebuild, this will save you a couple of hundred dollars. The cheaper pressure switch is much more compact.
Using the alternatives made for a little more compact and cleaner looking installation.
Nice alternative ... that RAP6354 is really over priced.
Do you have any pictures of the final installation that you can share?