MET-SEAL Adapters, MET-SEAL VCR® Adapters

DF Series Diffusers

The DF-MSA Series Diffusers feature standard UHV Met-Seal flanges, allowing the use of standard hardware. The incoming gas line connection is a ¼" VCR fitting. Construction of DF-MSA Series Diffusers are 304L and 316L stainless steel.

By incorporating DF-MSA Series Diffusers in your system, you can dramatically cut cycle time as opposed to conventional venting procedures and have less particle issues to address.

Maximum inlet pressure = 30 psig
Maximum operating temperature = 120 ° C

DF Series Diffusers

PART NUMBER	BASE FLANGE	VCR FITTING	PRESSURE DROP AT 20 CFM/ft²	SCCM FLOW RATE	A
DF-MSA133-FV25	1-1/3" OD	¼" Female	0.5 PSI	1,000	1.46
DF-MSA133-MV25	1-1/3" OD	¼" Male	0.5 PSI	1,000	1.46
DF-MSA275-FV25	2-3/4" OD	¼" Female	0.1 PSI	4,500	1.46
DF-MSA275-MV25	2-3/4" OD	¼" Male	0.1 PSI	4,500	1.46

MET-SEAL Flange to Female VCR® Adapter

PART NUMBER	NOMINAL FLANGE OD	VCR SIZE	A	B
MSA133-FV25	1.33	1/4	1.46	.19
MSA212-FV25	2.12	1/4	1.51	.19
MSA212-FV50	2.12	1/2	1.70	.41
MSA212-FV75	2.12	3/4	2.20	.62
MSA275-FV25	2.74	1/4	1.51	.19
MSA275-FV50	2.74	1/2	1.70	.41
MSA275-FV75	2.74	3/4	2.20	.62
MSA338-FV25	3.36	1/4	1.69	.19
MSA338-FV50	3.36	1/2	1.89	.41
MSA338-FV75	3.36	3/4	2.39	.62

MET-SEAL Flange to Male VCR® Adapter

PART NUMBER	NOMINAL FLANGE OD	VCR SIZE	A	B
MSA133-MV25	1.33	1/4	1.46	.19
MSA212-MV25	2.12	1/4	1.51	.19
MSA212-MV50	2.12	1/2	1.70	.41
MSA212-MV75	2.12	3/4	2.20	.62
MSA275-MV25	2.74	1/4	1.51	.19
MSA275-MV50	2.74	1/2	1.70	.41
MSA275-MV75	2.74	3/4	2.20	.62
MSA338-MV25	3.36	1/4	1.69	.19
MSA338-MV50	3.36	1/2	1.89	.41
MSA338-MV75	3.36	3/4	2.39	.62

Product information is subject to change without notice. Product images may include options or accessories not included with the base model.

Precision Welded. Performance Proven.

For 50 years, Key High Vacuum Products, Inc. has been a trusted leader in precision-engineered stainless steel high vacuum weldments. With tens of thousands of unique weldments in use—from particle accelerators to industrial leak detectors—our expertise is proven across industries. Rooted in innovation, craftsmanship, and an unwavering commitment to customer satisfaction, we deliver high-quality, customized solutions that drive success. Every day, our team brings a unique blend of passion and precision, ensuring your goals are met with excellence—because your mission matters. Experience the Key High difference.