Filler Breather - Threaded Style - Hydraulic Filters

These filler breathers have a threaded fitting, making them easy to install as filler ports for hydraulic reservoirs. Filler breathers have a unique design which provide air flow while keeping out contaminants and particles. Essential in heavy industrial environments.

Benefits

Breathers provide clean air flow into reservoirs where there is an exchange of air during changes in tank fluid levels
Available with grip cap as a standard product
Easy to install

Features

Steel cap with multiple cap finishes
Compatible with petroleum based fluids
OBT-P style (pressurized)
- Air intake valve opens at 0.435 PSI/3 KPԚ
- Relief valve setting at 5 psi/.34 Bar
OBT style (non-pressurized)
- Air flow to 30 CFM/850 LPM
- Operating temperature up to 212° F

Options

Zinc, chrome and black e-coat (zinc cap standard)
3 micron (non-pressurized), 10- and 40-micron filters available – 10 micron standard
Contact factory for dipstick labeling options

Cap Finish		Code
Black E-Coat		B
Chrome Plated		C
Zinc Plated		Z
Filter		Code
3 Micron - OBT only		3
10 Micron		10
40 Micron		40
Fitting Type	Size	Code
BSPP	3/4	B-3/4
BSPP	3/4 Black	B-3/4 BL
NPT	1/2	N-1/2
NPT	3/4	N-3/4
NPT	3/4 Black	N-3/4 BL
NPT	1	N-1
SAE	1-1/16 Black	S-12 BL
Available Options		Code
Dipstick		D
None		Omit

All dimensions are in inches and for reference only.

How to Order: OBT-P (pressurized) series - Chrome Cap, 1/2" NPT with 40-micron filter = OBT-P-C-40-N-1/2

Style	Cap Finish	Filter	Fitting Type	Option
OBT-P	C	40	N-1/2

How to Order: OBT (non-pressurized) series – Chrome Cap, 1/2" NPT with 40-micron filter non-pressurized = OBT-C-40-N-1/2

Style	Cap Finish	Filter	Fitting Type	Option
OBT	C	40	N-1/2

OBT-P Pressurized Cap

OBT Non-Pressurized Cap

Download our product information

Filler Breather – Threaded Style