BumGenius has a very short nozzle lip. Although you loose some Spray Collar functionality, it still fits just fine.
Most cloth diaper brands get their sprayers from the same manufacturer. For example, the Blueberry Flo diaper sprayer is the same as the OsoCozy diaper sprayer.
The Bumgenius Sprayer is the same as the original Aquaus sprayer, and the Spray Pal sprayer is the same as the Bumkins.
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How to Mount Your BG Sprayer
With your Spray Collar attached, hang your BG sprayer inside the mount BACKWARDS.