The right multi-point locking mechanism depends on the door type and the replacement part’s exact dimensions. For sliding patio doors, the G.A.S. 11-3/4-inch mortise lock is best for buyers matching 11-inch mounting-hole centers, while the Prime-Line latch suits compatible sliding doors with its specified hook and mounting measurements. Pella storm-door owners can consider the Eockatoo lock body, but must retain the original Pella key cylinder. Compare measurements and parts before ordering; a keeper alone is not a complete lock.
| Product | Best For | Key Detail |
|---|---|---|
| G.A.S. 11-3/4-inch mortise lock | Sliding patio doors | 11-inch mounting-hole centers; anti-slam button |
| Eockatoo 2-point lock body | Some Pella storm doors | Requires original Pella-brand key cylinder |
| G.A.S. 9-15/16-inch mortise lock | Sliding patio doors | Mounting holes 9-15/16 inches on center |
| G.A.S. 10-7/8-inch keeper | Keeper-only replacement | Keeper only; lock and handle not included |
| Prime-Line multi-point latch | Specified sliding-door setups | Dual hooks and 7-13/16-inch mounting-hole spacing |
G.A.S. 11-3/4-Inch Patio Door Mortise Lock
This two-point mortise lock is designed for a sliding patio glass door. Its face plate is 11-3/4 inches long, and its installation holes measure 11 inches on center. The actuator is centered or 3/4 inch offset, so check your existing hardware before choosing it.
Best for: Buyers replacing a compatible patio-door lock who need the listed 11-inch hole spacing and want an anti-slam button. The button helps prevent damage to the double-lock hooks if the door closes while they are extended; the lock actuates when the button is pressed against the frame or strike plate.
Limitation: Attaching screws are sold separately. Confirm the actuator position and measurements before ordering.
Eockatoo Pella Storm Door Lock Body
This replacement lock body has a two-point bolt design and is intended for some Pella storm doors. Listed measurements include an 8-1/2-inch faceplate, 13/16-inch faceplate width, 7-1/4-inch screw-hole spacing, and 2-1/2 inches between bolts. The stated handle-center-to-cylinder-center measurement is also 2.5 inches.
Best for: Pella storm-door owners replacing a damaged internal lock body without replacing the entire handleset, provided the door matches the dimensions.
Limitation: The original Pella-brand key cylinder must be reused. The listing says incompatible cylinders can cause malfunction and notes that the lock fits most, but not all, Pella storm-door models. Verify the measurements and cylinder requirement first.
G.A.S. 9-15/16-Inch Two-Point Mortise Lock
This two-point mortise lock is for sliding patio glass doors and uses installation holes spaced 9-15/16 inches on center. It includes an anti-slam button intended to help protect the double-lock hooks if the door closes with the hooks extended. The button must be depressed against the frame, strike plate, or keeper for the lock to actuate.
Best for: Buyers whose existing lock matches the 9-15/16-inch mounting-hole spacing and who need a two-point replacement mechanism.
Limitation: The listing specifies that this model has no face plate. Compare the old lock’s configuration and measurements rather than assuming it is interchangeable with a faceplate-equipped model.
G.A.S. Patio Door Multi-Point Keeper
This is a keeper for a two-point mortise-lock system, not a complete locking mechanism. It measures 10-7/8 inches long by 1/2 inch wide and 1/2 inch high. The listing identifies it as a keeper for an 11-3/4-inch mortise lock.
Best for: Buyers replacing only the keeper and who have verified the listed dimensions and lock arrangement. A correctly matched keeper is the part that works with the lock to receive its locking points.
Limitation: The mortise lock and handle are not included. Choose a complete lock if those are the parts that need replacement.
Prime-Line Multi-Point Sliding Door Mortise Latch
This latch is intended to replace worn or damaged multi-point mortise locks on compatible sliding patio doors, including select Roto door systems and similar applications. It has two opposing hooks spaced 3-3/4 inches on center, 7-13/16-inch mounting-hole spacing, and a 9/16-inch-thick housing. Its components include diecast metal and aluminum, plus a chrome-plated rounded faceplate.
Best for: Buyers whose existing latch matches these dimensions and the stated compatible lock-cylinder applications, including Prime-Line C 1275, C 1277, and E 2000.
Limitation: Compatibility is specified for select systems, not every sliding patio door. Measure the housing, mounting holes, hooks, and cylinder application before selecting it.
Buying Guide: How to Choose a Multi-Point Lock
Is the door a patio slider or a storm door?
Start with the door type. The G.A.S. and Prime-Line options are described for sliding patio doors; the Eockatoo body is intended for some Pella storm doors. A similar-looking lock is not necessarily a compatible replacement.
Which measurements should you compare?
Measure the old mechanism before ordering. Check faceplate length and width, mounting-hole spacing, hook or bolt spacing, housing thickness, and actuator position where applicable. Use the product’s listed dimensions as a match checklist. Do not rely on a single measurement if other dimensions are provided.
Do you need the lock, keeper, or both?
A mortise lock or latch is the mechanism that operates the locking points. A keeper is a separate receiving component. The G.A.S. keeper listing does not include a lock or handle, so it is appropriate only when the keeper itself is the part being replaced.
What should storm-door owners check?
For the Eockatoo replacement, confirm the Pella-specific measurements and retain the original Pella-brand key cylinder. The product listing warns that an incompatible cylinder can cause malfunction. Check the exact door model and dimensions because the listing says it does not fit every Pella storm door.
Frequently Asked Questions
What does a multi-point locking mechanism do?
It secures a door at more than one point. The products here describe two-point systems that use hooks or bolts.
Can I choose a replacement by faceplate length alone?
No. Also compare mounting-hole spacing, locking-point spacing, housing dimensions, and other listed fit details.
Does the G.A.S. keeper include a mortise lock?
No. It is sold as a keeper only; the lock and handle are not included.
Can I use any key cylinder with the Eockatoo storm-door lock body?
No. The listing requires the original Pella-brand key cylinder and warns that an incompatible cylinder can cause malfunction.