The RO membrane housing made of stainless steel which is waterproof and non-rusting that make the filter a long service llife 4,  8Stainless Steel Membrane HousingFeatures:

1) Material of the housing : Stainless steel 304 or 316L

2) The material of lid is ABS plastic

3 )Membrane housing can be fix 1-4 stage RO membranes

4) Maximum operating pressure 250PSI (17 bars)5) Stainless steel, high polished exterior6)4 End entry ;     4,  8End entry and side entry7) Smooth and sleek look8) Unique design saves both time and money9) Designed fro direct connection to most style of RO elements10) Double O-ring12) Packing: Carton

	(mm)		(mm)	(mm)		(mm)
4021	600		540	Dg 15 , 1/2		Dg15 , 1/2
4040-1	1090		1030	Dg 20, 3/4		Dg15, 1/2
4040-2	2106		2046	Dg 20 , 3/4		Dg 15 , 1/2
4040-3	3122		3062	Dg 20 , 3/4		Dg 20 , 3/4
4040-4	4138		4018	Dg 20 , 3/4		Dg 20 , 3/4
8040-1		1281	1093		Dg 40, 3/2	Dg 25 , 1
8040-2		2297	2109		Dg 40, 3/2	Dg 25 , 1
8040-3		3313	3125		Dg 40, 3/2	Dg 25 , 1
8040-4		4329	4141		Dg 40, 3/2	Dg 25 , 1
8040-5		5345	5157		Dg 40, 3/2	Dg 25 , 1
8040-3		6361	6173		Dg 40, 3/2	Dg 25 , 1

(10) 8" RO Membrane Housing