Two RV propane cylinders are commonly held to a tray by a centre threaded rod and a top crossbar. A lock can help prevent someone from removing the hold-down hardware, but it must match that mounting arrangement. This guide compares TorkLift A7701 and A7702, the Camco 40590 combination lock and the AP Products 013-705 keyed assembly, with a diagram of where each part belongs.
How the cylinder hold-down and locking parts relate
Identify the parts you already have before ordering a security lock. A lock is fitted to the existing retention assembly; the tank pan, threaded post and crossbar still need to hold the cylinders properly.
Actual cylinder retention
Optional anti-theft device
Which lock fits a 3/8-inch or 1/2-inch threaded rod?
| Lock model | Documented centre rod | Lock type and contents |
|---|---|---|
| TorkLift A7701 | 3/8 inch | Powder-coated aluminum Fortress GasLock assembly, keyed lock and keys |
| TorkLift A7702 | 1/2 inch | Larger-rod Fortress GasLock configuration, keyed lock and keys |
| Camco 40590 | 3/8 or 1/2 inch | Zinc-plated steel assembly with separate top plates, lock plate and combination padlock |
| AP Products 013-705 | Match existing bracket and wing-nut arrangement | Keyed-alike padlock and locking hasp with LP-regulator mounting bracket; not a universal rod-size claim |
TorkLift calls its keyed locks the Fortress GasLock family. The manufacturer assigns A7701 to 3/8-inch rods and A7702 to 1/2-inch rods. Camco 40590 instead supplies a 3/8-inch and a 1/2-inch top plate for its combination-padlock design. The plates do not mean that every tank rack, cover and regulator bracket will fit without checking clearance.
AP Products 013-705 is another design: the supplied hasp prevents the existing tank-retaining wing nut from being turned and includes provision for mounting the LP regulator. Its fit should be assessed from the physical rack and regulator setup, rather than assuming it follows either TorkLift rod-size rule.
The parts that actually hold the cylinders
JR Products identifies 07-30485 as a polar-white dual-cylinder tank pan and 07-31535 as the black version. Its wider tank-retention family also names a notched hold-down bar 07-30475, 1/2-inch threaded rods 07-30515 for 20-lb cylinders and 07-30525 for 30-lb cylinders, plus a galvanized wing nut 07-30535. These are separate replacement-part references, not items guaranteed to come with either pan.
Inspect the mounting platform and existing hardware. A locking kit is a theft deterrent; it cannot repair a corroded pan, missing crossbar, insecure threaded rod or unsupported propane cylinder. Maintain access to cylinder shutoff valves and use approved tank retention hardware.
Compare the exact locks and mounting pans
These are NewRVParts catalog items, linked by their exact product numbers. View each product for current availability and complete details; the photos are identification aids and do not establish a universal fit.
Manufacturer model references
Confirm the rod-size choices on the TorkLift Fortress GasLock manufacturer page. The JR Products tank-parts reference identifies the separate pan, rods, bar and wing nut. Always follow the exact tank-mount and security-kit instructions for your vehicle.