Extend-A-Stay RV Propane System: Complete Installation Guide & Safety

Short Answer

Yes, you can absolutely relocate your RV's main regulator before the Extend A Stay to eliminate carrying the Blackstone's regulator around. This requires installing a tee fitting at your RV's main propane regulator outlet and running a dedicated regulated line to your Extend A Stay connection point. The key is ensuring you maintain proper gas pressure (11" water column, which equals approximately 0.398 PSI) to both your RV appliances and your external connection.

Understanding the Problem

Your current setup has the Extend A Stay tapping into the high-pressure side of your RV's propane system (before the regulator), which is why you need the Blackstone's regulator to step down the pressure. The Extend A Stay's standard fittings are designed for this high-pressure connection, typically around 100-200 PSI from your tank depending on temperature, though it can reach much higher pressures in hot conditions.

What you want is to tap into the low-pressure side (after your RV's main regulator) so the gas is already regulated to the proper 11" water column pressure (approximately 0.398 PSI) that your Blackstone expects. This would eliminate the need for the Blackstone's regulator entirely. The challenge is that most Extend A Stay units come with high-pressure fittings, not the low-pressure quick-connect fittings you'd need for a regulated line.

The solution involves relocating your connection point and potentially modifying your gas distribution system. This is definitely doable, but requires some specific fittings and careful attention to gas line sizing to ensure adequate flow to both your RV appliances and external connection.

What You'll Need

For this modification, you'll need several specific components to create a regulated gas line to your Extend A Stay location. Start with a brass tee fitting - use the correct part for your model (verify with dealer) that matches your RV's main regulator output - typically 1/2" NPT or 3/8" flare fitting. You'll also need a length of flexible gas line rated for low-pressure propane use, usually 3/8" or 1/2" depending on your system.

The critical component is an adapter that converts from your regulated gas line to whatever fitting your Extend A Stay uses - likely a specific quick-connect fitting designed for the Extend A Stay system. You may need to replace the Extend A Stay's current fitting with a quick-connect fitting designed for regulated pressure, which are readily available at RV supply stores.

Don't forget the safety components: you'll need pipe thread compound rated for gas connections, and it's wise to install a shut-off valve in the new line for maintenance purposes. A pressure gauge temporarily connected during installation will help verify you're getting proper pressure at the external connection point.

How to Fix It

WARNING: This modification involves working with propane gas lines. Turn off propane supply and ensure all appliances are off before beginning. Gas line modifications can be dangerous if done incorrectly - consider professional installation for safety.

Start by turning off your propane supply at the tank and ensuring all appliances are off. Locate your RV's main propane regulator - it's usually mounted near the tanks with gas lines running from it to your various appliances. You'll be installing a tee fitting at the regulator's outlet to create a branch line for your external connection.

Remove the main gas line from your regulator's outlet and install your tee fitting using proper pipe thread compound, tightening to manufacturer specifications. Reconnect the main RV gas line to one branch of the tee, and connect your new external line to the other branch. Run this new line to where you want your external connection point, securing it properly and avoiding sharp edges or heat sources.

At the external end, install either a quick-connect fitting or modify your Extend A Stay to accept regulated pressure input. If keeping the Extend A Stay, consult manufacturer specifications as these systems are designed for high-pressure connections and modifications may void certification. Perform proper pressure testing with appropriate equipment and test your entire system with soapy water or electronic leak detector for leaks before putting it into service. System must be pressure tested to manufacturer specifications.

Once everything is connected and leak-tested, turn on your propane supply and verify that both your RV appliances and external connection are getting proper pressure. Your Blackstone should now operate directly from this regulated connection without needing its own regulator.

Leave It to the Experts

While this modification is within the skill range of many DIY RV owners, propane system work carries serious safety implications if done incorrectly. If you're not completely comfortable working with gas fittings and pressure testing, consider having a certified RV technician or propane specialist handle this modification.

A professional can also advise you on proper gas line sizing to ensure adequate flow to all your appliances when the external connection is in use. They'll have the proper leak detection equipment and pressure testing tools to verify your system is safe and functioning correctly. The cost for professional installation typically runs $200-400 depending on the complexity of your RV's gas system and the routing required for the new line.

Additionally, some RV manufacturers have specific requirements about propane system modifications that could affect warranty coverage. A certified technician will be familiar with these requirements and can ensure your modification meets all applicable codes and standards. Common causes of propane system failures include improper fittings, inadequate pressure testing, and incorrect gas line sizing - all issues that professional installation helps avoid.