Read off Sam's photos of the rating label + inlet:
| Model | HT-400 Portable Gas Grill — "For use with LP Gas" |
|---|---|
| Input | 12,000 BTU/H |
| Id # | 208837 |
| Certification | CSA / Design certified to ANS Z21.89 / CSA 1.18-2013 (the outdoor-cooking-appliance standard) |
| Mfr / contact | DDR-LLC, Bristol, Indiana 46507 — TEL 574-970-5650 (US contact). Made in China (Foshan Juguan Metal Mfg). |
| Inlet | ~1/4" threaded port on the control/knob box. The removed RV quick-connect had a threaded nub that screwed into this ~1/4" tube. SAM to confirm exact thread by measuring. |
It is NOT yet verified that the HT-400 has its own regulator — and the evidence suggests it may NOT. The grill ran off the RV's regulated gas lines (i.e. it was fed low pressure); it is a modest 12,000 BTU/H appliance certified to ANS Z21.89. Those are all consistent with a grill that expects regulated, low-pressure gas and has no internal regulator of its own.
Why this matters (the hazard): a 1 lb disposable bottle is HIGH-PRESSURE / unregulated. Connecting a 1 lb bottle through a plain (non-regulated) adapter directly into a grill that has no internal regulator sends unregulated high-pressure propane into a low-pressure appliance — a fire / flashback hazard.
⛔ DO NOT buy a plain (non-regulated) adapter until the regulator question is answered.
⚠ Flagged UNVERIFIED 2026-06-29The earlier note "the grill HAS its own regulator — its control knob is an on/off + min/med/max regulator (CONFIRMED 2026-06-08, Sam)" is NOT confirmed. A control knob can be a simple burner valve (variable flow), which is not the same as a gas pressure regulator. Treat the 2026-06-08 note as an assumption to be checked — the DDR phone call is what settles it. (Note kept, not deleted, for the record.)
Goal: an adapter/hose from a 1 lb disposable cylinder (the green camp bottles, 1"-20 throwaway-cylinder thread) to the grill's RV 1/4" quick-connect fitting. Which part you buy depends entirely on the regulator answer above.
⚠ If NO internal regulator (suspected)Buy a regulator + hose kit. If the DDR call confirms the HT-400 has no built-in regulator (the suspected case — it ran off regulated RV gas), you need a hose with a disposable-cylinder (1 lb) port + a built-in regulator (or a 20 lb tank → regulator) feeding the grill's 1/4" inlet. A plain adapter here would be unsafe (high-pressure propane into a low-pressure appliance).
Only IF self-regulatesPlain adapter OK — only after DDR confirms a built-in regulator. If (and only if) the grill self-regulates, adapt the 1 lb bottle thread (1"-20) to the grill's 1/4" inlet with a plain adapter — and do NOT add a second regulator (two in series starves the burner). Do not assume this path until the DDR call settles it.
The category to search is the "RV/grill 1/4" quick-connect to 1 lb throwaway bottle" adapter/hose: 1"-20 throwaway-cylinder thread on one end, 1/4" quick-connect on the other. The plain vs regulated version is what differs.
| Brand | Notes | Approx price |
|---|---|---|
| MB Sturgis | US-made, reputable; makes both plain QC adapters and regulated disposable-cylinder hoses | SAM-FILL |
| GASPRO | Common QC-to-1 lb adapters/hoses | SAM-FILL |
| WADEO | Common QC-to-1 lb adapters/hoses | SAM-FILL |
| Stanbroil | CSA-certified options | SAM-FILL |
Category typically runs ~$15-30 — confirm the exact part + price. Sources: Amazon, Walmart, etrailer, propanegear. SAM-FILL: chosen part # + price once the regulator question is answered.
The mount is blocked only on measurements + photos. Knock these out and CC finishes the exact part pick:
PHOTOGRAPH (4 shots):Drop the 4 photos + 2 measurements + the 3 classifications in, and CC picks the exact rail-clamp mount (Arnall's / Camco / generic) + whether you fabricate a bridge adapter plate to match the bracket interface.
B09VKZGRJC) — the propane/regulator question (Section 1) is resolved; only the MOUNT remains.Two paths. Path B (universal rail clamp) is the more reliable one given the OEM bracket may be hard to find.
May be discontinuedSearch for the original / replacement DDR HT 400 RV bracket. DDR-branded RV grills are obscure and may be discontinued, so the OEM bracket may be unavailable. SAM-FILL: OEM bracket part # + source IF found; otherwise flag discontinued and use Path B.
A rail-clamp mount clamps to the pontoon rail and gives you a plate/post to adapt the grill's bracket to. This is the dependable path. Example categories/brands: pontoon grill rail mounts — Arnall's, Camco pontoon grill mount, and generic rail-clamp mounts.
Approach: rail-clamp → mounting plate/post → adapt the grill's existing bracket to it. Given Sam's shop capability, a simple adapter plate he fabricates may bridge the rail-mount post to the grill bracket's bolt pattern. SAM-FILL: exact rail-mount part + price once the two measurements are known.
| Need | Buy | Gate before buying |
|---|---|---|
| Propane: 1 lb → grill inlet | DECIDED BY THE DDR CALL. No internal regulator → regulator + hose kit. Self-regulates → plain 1"-20 → 1/4" adapter. Brands: MB Sturgis / GASPRO / WADEO / Stanbroil. Do NOT buy a plain adapter until confirmed. | GATE: call DDR 574-970-5650 (regulator yes/no + inlet pressure). Then SAM-CONFIRM exact inlet thread. SAM-FILL: part # + price. |
| Mount: grill → pontoon rail | OEM DDR bracket (if findable) — OR — universal rail-clamp mount (Arnall's / Camco / generic) + possible adapter plate (Sam can fabricate). | SAM-FILL: (1) pontoon rail profile/size; (2) grill mount interface. These pick the rail mount + adapter. OEM part # if found. |
| Optional | Refillable 1 lb bottle; heat shield material; soapy-water leak-check bottle. | SAM-FILL: as chosen. |
SAM-CONFIRM (inspect / measure):
SAM-FILL (after the above): chosen propane adapter part # + price; chosen rail mount (or OEM bracket) part # + price; any fabricated adapter-plate plan.