Standard & Giant Filter Housings
(Click on images below for black & white drawings)

Standard Housings

Standard housings offer the following:

• White talc reinforced polypropylene head with blue talc reinforced or clear styrene acrylonitrile (SAN) bowl.

• Standard 3/4" NPT connections.

• Securely retained Buna "N" O-Ring to ensure effective sealing by positive tangential contact, eliminates accidental misplacement, provides longer life.

• Positive head to bowl "stop" to prevent bowl over tightening.

• Available from stock with or without pressure relief vent button.

• Custom color available by special order.

• Mounting bosses in head for available bracket.

• Accepts industry standard cartridge size: 2¾" O.D. x 1" I.D. x9¾" (full length), 4 7/8" (half size) and 20" (double length).

• Full testing to industry standards of the Water Quality Association for burst pressure, water tightness and fatigue resistance.

Valve-In-Head Housings

These housings provide the easiest possible installation and maintenance.  Includes same features as Standard Housings plus the following:

• These housings provide the easiest possible installation and maintenance.  Includes same features as Standard Housings plus the following:

• Built in valve has "on", "off", and "by-Pass" positions.

• Valve internals of acetal copolymer and valve handle of acrylonitrile butadiene styrene (ABS).

• Pressure vented automatically as handle is turned from "on" to "off".

• Unique head design prevents potential bypassing by not disturbing cartridge seals when valve is operated.

Giant Housings

Giant housings offer maximum filtration capacity in a compact unit.  These housings feature:

• Talc polypropylene, clear styrene and natural polypropylene construction. 
• 1" and 1-1/2" NPT or BSP connections in same head.
• NSF approval on talc polypropylene and clear styrene housings.*
• 125 psi maximum operating pressure.
• Nylon housings for high temperature and high pressure service.
• Bag housings in all materials.  (Bags are also available). Request Bulletins GH-B and GB-P.

Reinforced Nylon Housings

These housings are suitable for high temperature and high pressure service.  Features include:

• Distinctive red color.
• High strength glass reinforced nylon head and bowl.
• Standard 3/4" NPT connections.
• Securely retained Buna "N" O-Ring to ensure effective sealing by positive tangential contact; eliminates accidental misplacement; provides longer life.
• Not available with pressure relief vent button.
• full testing to industry standards of the Water Quality Association for burst pressure, water tightness and fatigue resistance.

Stainless Steel Housings

SINGLE TUBE

Keystone's versatile and rugged stainless steel housings are useful for a broad range of applications. Their features include:

• Cast bronze nickel-plated heads with nickel-plated "T" handle cap nut. Shell is a unibody style made of 304 stainless steel.
• "T" handle top nut and petcock bottom drain eliminate the need for tools when changing cartridges.
• Machined groove in underside of head retains Buna"N" gaskets for positive sealing.
• 3/4" NPT connections are standard. 1" NPT is also available.

• High quality 304 stainless steel construction with epoxy coating on outside of housing.
• Belly-band clamp closure is included for easy cartridge change.
• 1/2" drains are provided on clean and dirty sides.
• Larger multiple cartridge housings with connection sizes up to 3" flange are also available.
• Additional exterior finishes are available; optional electro polished stainless steel is shown at above.

Pure Polypropylene Housings

Keystone's pure polypropylene filter housings are ideal for use in all industries where filtered liquids must remain totally free of contamination.  

Features include:

• 100% polypropylene construction.
• Smooth contact surfaces to prevent bacteria and dirt buildup.
• Utilizes a non-lubricated silicone O-ring standard.
• Standard 3/4" NPT connections.

Applications include:

• Deionized water.
• Laboratory instrumentation and equipment.
• Pharmaceutical/cosmetic solvents.
• Electronic solutions and chemicals.
• Post filter for reverse osmosis or ultrafiltration