why it not fit with my toilet tank ( Koller tank)

It should fit with most of tank for flushmate.Did you pull off inlet water hose from tank at left bottom. Pull off it then sure to fix with your tank for flushmate I think.

Is this the push button flush or the lever flush model? The part number and the item model number listed are different.

Push button but it comes with accessory parts for the lever flush as well which were in the box with all the needed instructions.

Helo, does it replace the original pressure vessel m-102540-f series 501-b ??

The Sloan M-102540-F Flushmate System is a complete pressure-assist flush system for 501-A or 501-B series tanks. It fits porcelain manufacturers American Standard, Crane, and Laufen tanks. If this is true I would believe this can replace the 501a and 501b and the m102540f. I hope this helps you out.

Is part number m-101526-f3bk the same as m-101526-f3b . i have a push button briggs toilet.

No it is not. M-101526-f3b is with the center push button. M-101526-f3b is with left or right handed flush handle.

Pressure Assist Flushing System Plastic

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Specifications

ASIN	B00HZ26BRM
Best Sellers Rank	#16,402 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Toilet Replacement Parts #343 in Toilet & Urinal Parts
Brand	Flushmate
Brand Name	Flushmate
Customer Reviews	4.5 out of 5 stars 1,031 Reviews
Exterior Finish	Plastic
Included Components	M-101526-F3BK Complete Replacement System
Inlet Connection Size	1 Inches
Inlet Connection Type	Two-Piece
Item Dimensions	18 x 8 x 17 inches
Item Weight	9 Pounds
Item dimensions L x W x H	18 x 8 x 17 inches
Manufacturer	Flushmate
Material	Plastic
Material Type	Plastic
Model Number	M-101526-F3BK
Number of Ports	2
Outlet Connection Size	3 Inches
Outlet Connection Type	Two-Piece Toilets
Size	1.6 GPF
Specification Met	ASME, ANSI, IAPMO, UPC, FM, CSA, UL, NSF, WaterSense
Thread Type	12" (300mm)
UPC	064871410641
Unit Count	1.0 Count
Valve Type	Pressure Relief Valve

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