4.5" Vacuum Mounting Cups offer a great solution for mounting a variety of equipment.
You can mount your GPS system, your PDA, your cell phone, your fish finder...virtually anything that adapts to a 1/4-20 3/8" or 5/8"  threaded stud or 1/4-20 threaded insert.
These powerful 4.5 inch vacuum cups will attach to autos, RV's, boats, windows, counter tops, windshields ... anything with a smooth, nonporous surface.

Features of the 4.5 inch Vacuum Mounting Cups
Provides a reliable, temporary vacuum mount, without drilling holes.
Rubber vacuum pad will not mark or damage most surfaces.
Mounts GPS systems, PDA's, cell phones, anything with a standard 1/4-20 thread [3/8" or 5/8"] threaded stud or 1/4-20 threaded insert.
Attaches to flat or curved, smooth, nonporous surfaces.
Durable polycarbonate accessory mount with threaded stud or insert for attaching equipment.
Red-line indicator warns user of any vacuum loss.
Check valve allows re-pumping without loss of remaining vacuum.
Lift tabs on pad edges permit instant release.
Supplied with pad protector.
Vacuum Pad: Concave, 4.5" [11 cm] diameter (model LJ45)
Minimum Radius for Curved Mounting Surface: 12" [305 mm]
Load Capacity: 40 lbs. [18 kg] per cup
Manufactured by Wood's Powr-Grip® Co., Inc.